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Question

 Calculate the number of ways in which 10 different students can be divided into two groups containing 6 and 4 students respectively.
  1. 10C6*10C4
  2. none of these


Solution

The correct option is C

Soln:

No. of ways = 10!(6!4!)

Hence option (c)  

2nd method:- Select any six then other four will be automatically selected. i.e 10C6=10!(6!4!)

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