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Q.

A bag contains 7 blue balls and 5 yellow balls. If two balls are selected at random, what is the probability that none is yellow?

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a

535

b

522

c

722

d

733

answer is C.

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Detailed Solution

Blue balls= 7 

None-ball out of two are yellow Yellow balls = 5 

Both balls are blue

 Total balls= 12

 P (both blue balls) =712×611=722

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