Re: PEA 2017 - Answer Key

Posted by happy on May 12, 2017; 12:27pm
URL: http://discussion-forum.276.s1.nabble.com/PEA-2017-Answer-Key-tp7604116p7604117.html

2nd Question

A box contains 90 good and 10 defective screws. If 10 screws are drawn without replacement, the probability that none of them is defective is


Question says 10 screws are drawn without replacement

by saying without replacement , it means screws are drawn one by one without replacement 

So we Should use Permutation Not Combination

the value of option C and A  are equal still i go for Option C