Probability

Question

From a gift pack of 5 items, 3 items are drawn, found that all of them are in red color. What is the probability that all are red?

Comments

NR(NOT RED)  R(RED)

R R R NR NR

R R R R NR

R R R NR R

R R R R R

so getting all red probability = 1/4

Answer 1

Question is basically asking what is the probability of other 2 items being red (so that all 5 are red).

So sample space = {(red, red), (red, not red), (not red, red), (not red, not red)}

P(all 5 are red) = 1/4

Option (3)

Answer 2

for remaining 2 items

possible choices are

3 -- > (Red,Not red) , (not Red,not Red) , (not red,Red)

1 --> (Red , Red)

so answer should be 1/4

Note: they have a wrong solution

Comments

I got it . .thnx buddy