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Question

If there is a term containing x2rin(x+1x2)n3, then :


A

n-2r is a positive integral multiple of 3

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B

n-2r is even

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C

n-2r is odd

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D

n = 2r

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Solution

The correct option is A

n-2r is a positive integral multiple of 3


Tp+1=n3Cpxn3px2p

2r = n-3-3p
p+1 = (n2r)3

(p+1) is an integer
(n-2r) is a positive integral multiple of 3.


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