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Question

If the coefficient of (2r+4)th and (r2)th terms in the 

expansion of (1+x)18 are equal, then r =


  1. 10

  2. 8

  3. 12

  4. 6


Solution

The correct option is D

6


18C2r+318Cr3   ⇒ 2r + 3 + r - 3 = 18   ⇒ r = 6  

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