A box contains 25 parts of which 10 are defective. Two parts are being drawn simultaneously in a random manner from the box. The probability of both parts being good is


This is reply by AI

This is a question that requires the use of Probability concepts

Probability = Favourable/Total
Both parts should be good
so 15/25 * 14/24 = 7/20

Another way using PnC

There are 15 good parts , total ways of selecting 2 parts simultaneously
= 15C2
Total ways of selecting = 25C2

Probability = 15C2 /25C2 = 7/20

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