Latest R-SAT Aptitude Question SOLUTION: A basket contains 6 red, 4blue, 3green and 2 yellow balls. If two balls are picked at random. What is the probability that either both are green or both are yellow? option A. 5/21

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(#M40024755) R-SAT Numerical Ability question Keep an EYE

A basket contains 6 red, 4blue, 3green and 2 yellow balls. If two balls are picked at random. What is the probability that either both are green or both are yellow?
option
A. 5/21
B. 101/105
C. 4/105
D. 3/35
E. None Of These

Asked In R-SAT ajay namdev (10 years ago)

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manogna  (10 years ago)

option c
(3C2+2C2)/15C2=4/105

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DARSHAN   (10 years ago)

P(E)=N(E)/N(S)

N(S)= 15C2(selecting 2 balls from total number of balls)
= 15!/(15-2)!*2!
= 105
probability that either both are green or both are yellow as to be pick
so, 1.we need to select 2 green balls from 3 green balls(ie 3c2) &
2.again we need to select 2 yellow balls from 2 yellow balls(ie 2c2)

N(E)=3c2 + 2c2
= 3 + 1
= 4

so that P(E)= 4/105

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niroshkumar   (10 years ago)

[3c2/15c2]+[2c2/15c2]=3/105+1/105=4/105

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