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Question

If the coefficient of (2r + 1)th term and (r + 2)th term are equal in expansion of (1+x)43 , then r =


A

14

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B

15

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C

13

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D

16

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Solution

The correct option is A

14


In (1+x)43 , coefficient of T2r+1 = Coeff. of T(r+1)+1

This 43C2r=43C2r=43Cr+1=433r=42r=14.


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