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Question

The middle term of expansion of (10x+x10)10

A
7C5
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B
8C5
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C
9C5
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D
10C5
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Solution

The correct option is D 10C5
Given

Fact: middle in the expansion of (x+y)n will be (n2+1)th term if n is even

Hence n=10= even

So middle term will be 6th term

Which is given by, 10C5(10x)5(x10)5=10C5

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