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Question

Find the term independent of x in the expansion of (2x1x)10:

A
4
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B
5
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C
6
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D
7
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Solution

The correct option is D 6
Tr+1=10Cr(2x)10r(x1)r
=10Cr210rx10r(x)r
102r=0
r=5
Term is 6 th term

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