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Question

If n2nC2 = n2nC10, then n = 


  1. 12

  2. 4 only

  3. 4 or -3

  4. -3 only


Solution

The correct option is C

4 or -3


n2nC2 = n2nC10n2nCn2n2 = n2nC10

n2n2 = 10 or n =4,-3

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