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Question

If the coefficient of (2r + 4)th term is equal to the coefficient of (r – 2)th term in the expansion of (1+x)18 then r =


A

1

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B

2

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C

3

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D

4

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Solution

The correct option is A

1


Coefficient of (2r + 1)th term = Coefficient of (4r + 5)th term 10C2r=10C4r+42r+4r+4=106r=6=1


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