# Recent questions tagged logical-reasoning

1
Fact: If it's cooked, the food is soft. Which of the following is a logically valid conclusion based on the above argument? It is cooked. The food is not soft. The food is soft. It is not cooked. If (III), then (IV). If (I), then (II). If (IV), then (II). If (II), then (IV).
2
Kevin is older than Tim. Jason is older than Kevin. Tim is older than Jason. If the statements (I) and (II) are TRUE, then (III) will be: Insufficient data True Not applicable False
1 vote
3
In the land of Twitter, there are two kinds of people: knights (also called outragers), who always tell the truth, and knaves (also called trolls), who always lie. It so happened that a person with handle @anand tweeted something offensive. It was not known ... Suspect $3:$ My lawyer always tells the truth. Which of the above suspects are innocent, and which are guilty? Explain your reasoning.
1 vote
4
Akash, Bharani, Chetan and Deepa are invited to a party. If Bharani and Chetan attend, then Deepa will attend too. If Bharani does not attend, then Akash will not attend. If Deepa does not attend, which of the following is true? Chetan does not attend Akash does not attend either (A) or (B) none of the above
1 vote
5
In a running race, Geetha finishes ahead of Shalini and Vani finishes after Aparna. Divya finishes ahead of Aparna. Which of the following is a minimal set of additional information that can determine the winner? Geetha finishes ahead of Divya and Vani finishes ahead of Shalini. Aparna finishes ahead of Shalini. Divya finishes ahead of Geetha. None of the above.
6
A student requests a recommendation letter from a professor. The professor gives three sealed envelopes. Each envelope contains either a good recommendation letter or a bad recommendation letter. Make a list of all the possible scenarios. Suppose now the professor tells the ... true and the other two are false. Can the student find out the contents of the envelopes without breaking their seals?
7
Identify the reasoning in the following argument : ‘Use of teaching aids in the classroom to enhance learning is important in a similar way as that of the use of ICT for production of knowledge’. Hypothetical Analogical Inductive Deductive
1 vote
8
The proposition ‘No historians are non-mathematician’ is equivalent to which of the following proposition? All historians are mathematicians No historians are mathematicians Some historians are mathematicians Some historians are not mathematicians
9
$P, Q, R, S, T$, and $U$ are seated around a circular table $R$ is seated two places to the right of $Q. \: P$ is seated three places to the left of $R. \: S$ is seated opposite $U.$ If $P$ and $U$ ... of $P$ or $P$ is immediately to the right of $Q$ $U$ is immediately to the right of $R$ or $P$ is immediately to the left of $T$
1 vote
10
A map shows the elevations of Darjeeling, Gangtok, Kalimpong, Pelling, and Siliguri. Kalimpong is at a lower elevation than Gangtok, Pelling is at a lower elevation than Gantok. Pelling is at a higher elevation than Siliguri. Darjeeling is at a higher elevation than Gangtok. ... than Siliguri Siliguri is at a lower elevation than Gangtok Only ii Only ii and iii Only ii and iv Only iii and iv
11
Four cards lie on table. Each card has a number printed on one side and a colour on the other. The faces visible on the cards are $2,3,$ red, and blue. Proposition: If a card has an even value on one side, then its opposite face is red. The card which MUST be turned over to verify the above proposition are $2,$ red $2,3,$ red $2,$ blue $2,$ red, blue
12
Given the sequence $A,B,B,C,C,C,D,D,D,D,\ldots$ etc$.,$ that is one $A,$ two $B’s,$ three $C’s,$ four $D’s,$ five $E’s$ and so on, the $240^{th}$ latter in the sequence will be $:$ $V$ $U$ $T$ $W$
13
Let there be a pile of $2018$ chips in the center of a table. Suppose there are two players who could alternately remove one, two or three chips from the pile. At least one chip must be removed, but no more than three chips can be removed in a single move. ... this game, that is, whatever moves his opponent makes, he can always make his moves in a certain way ensuring his win? Justify your answer.
14
Relate to inhabitants of the island of knights and knaves created by Smullyan, where knights always tell the truth and knaves always lie. You encounter two people, $A$ and $B$. Determine, if possible, what $A$ and $B$ are if they address you in the ways described. If you can ... what these people are, can you draw any conclusions ? $A$ says At least one of us is a knave and $B$ says nothing.
15
All shirts are T-shirts with buttons. No yellow T-shirt has buttons. No shirt is yellow. If the first two statements are true, the third statement is (A) True (B) False (C) Uncertain
1 vote
16
If $E=10,J=20,O=30,$ and $T=40,$ what will be $P+E+S+T?$ $51$ $82$ $120$ $164$
17
$P, Q, R, S$ and $T$ are related and belong to the same family. $P$ is the brother of $S, Q$ is the wife of $P$. $R$ and $T$ are the children of the siblings $P$ and $S$ respectively. Which one of the following statement is necessarily FALSE? $S$ is the aunt of $R$ $S$ is the aunt of $T$ $S$ is the sister-in-law of $Q$ $S$ is the brother of $P$
18
Mohan, the manager, wants his four workers to work in pairs. No pair should work for more than $5$ hours. Ram and John have worked together for $5$ hours. Krishna and Amir have worked as a team for $2$ hours. Krishna does not want to work with Ram. Whom should Mohan allot to work with John, if he wants all the workers to continue working? Amir Krishna Ram None of three
19
Four people are standing in a line facing you. They are Rahul, Mathew, Seema and Lohit. One is an engineer, one is a doctor, one a teacher and another a dancer. You are told that: Mathew is not standing next to Seema There are two people standing between Lohit ... other Seema is turning to her right to speak to the doctor standing next to her Who among them is an engineer? Seema Lohit Rahul Mathew
20
Consider five people- Mita, Ganga, Rekha, Lakshmi, and Sana. Ganga is taller than both Rekha and Lakshmi. Lakshmi is taller than Sana. Mita is taller than Ganga. Which of the following conclusions are true? Lakshmi is taller than Rekha Rekha is shorter than Mita Rekha is taller than Sana Sana is shorter than Ganga $1$ and $3$ $3$ only $2$ and $4$ $1$ only
1 vote
21
Five numbers $10,7,5,4$ and $2$ are to be arranged in a sequence from left to right following the directions given below: No two odd or even numbers are next to each other. The second number from the left is exactly half of the left-most number. The middle number is exactly twice the right-most number. Which is the second number from the right? $2$ $4$ $7$ $10$
22
Direction:Each data sufficiency problem consists of a question and two statements,labeled $(1)$ and $(2)$,which contain certain data.Using these data and your knowledge of mathematics and everyday fact(such as the number of days in july or the meaning of the word counterclockwise),decide whether the data given are sufficient for ... $(2)\sqrt{x}<y$ $Q2)$ Is $m>n?$ $(1)n-m+2>0$ $(2)n-m-2>0$
1 vote
23
If $A+B$ means $A$ is the brother of $B$, $A-B$ means A is the sister of $B$, $A \times B$ means $A$ is the father of $B$. Then which of the following means that $C$ is the son of $M$? $M-N \times C +F$ $M \times N - C +F$ $F-C+N \times M$ $N+M - F \times C$
24
Avni and Badal alternately choose numbers from the set $\{1,2,3,4,5,6,7,8,9\}$ without replacement (starting with Avni). The first person to choose numbers of which any $3$ sum to $15$ wins the game (for example, Avni wins if she chooses the ... has a winning strategy Both of them have a winning strategy Neither of them has a winning strategy The Player that picks $9$ has a winning strategy
Suppose there are $n$ guests at a party (and no hosts). As the night progresses, the guests meet each other and shake hands. The same pair of guests might shake hands multiple times. for some parties stretch late into the night , and it is hard to keep track.Still, they don't shake hands with ... $2 \mid \text{Even} \mid - \mid \text{Odd} \mid$ $2 \mid \text{Odd} \mid - \mid \text{Even} \mid$
Look at this series: $25, 25, 37, 37, \dots , 51, ….$. What number should fill the blank? $51$ $39$ $23$ $25$