Question:

 If nC4, nC5 and nC6 are in A.P., then n is 

Updated On: Apr 27, 2024
  • (A) 7 or 14
  • (B) 7
  • (C) 14
  • (D) 14 or 21
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The Correct Option is A

Solution and Explanation

Explanation:
pC4,zC5,C6 are in AP2nC5=nC4+2C625(n5)=1(n4)+130by solving n=14 or 7
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