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Question

The middle term of expnsion 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
Total number of terms in the expansion of (10x+x10)10 is 11, so the middle term is 6th term
t6=10C61(10x)61(x10)106+1=10C5

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