15 votes
10 answers
122
If $pqr \ne 0$ and $p^{-x}=\dfrac{1}{q},q^{-y}=\dfrac{1}{r},r^{-z}=\dfrac{1}{p},$ what is the value of the product $xyz$ ?$-1$$\dfrac{1}{pqr}$$1$$pqr$
15 votes
10 answers
123
$\text{ What is the missing number in the following sequence?}$$$2,\,12,\,60,\,240,\,720,\,1440,\,\underline{\;\;\;\;\;\;\;\;},0$$$2880$$1440$$720$$0$
33 votes
10 answers
127
57 votes
10 answers
128
Let $p, q, r$ denote the statements ”It is raining”, “It is cold”, and “It is pleasant”, respectively. Then the statement “It is not raining and it is pleas...
73 votes
10 answers
129
66 votes
10 answers
130
49 votes
10 answers
131
44 votes
10 answers
132
11 votes
10 answers
136
Suppose two jobs, each of which needs $10$ minutes of CPU time, start simultaneously. Assume $50\%$ I/O wait time. How long will it take for both to complete, if they run...
49 votes
10 answers
139