why have some problems included combination formula that is ncert ex 13.4 problem no. 6 plz sir exaplain this problem and rason for the use of combination formula and when to use it ..

Asked by Alina Imtiyaz imtiyaz | 6th Jan, 2014, 10:45: AM

Expert Answer:

Since here we are using two different object which is a combination of defective and non-defective thatswhy we use combination formula.

Answered by  | 7th Jan, 2014, 11:15: AM

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