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Question

If (1+x)n=C0+C1x+C2x2+...+Cnxn then C01+C23+C45+....=

A
2n
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B
2nn1
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C
2nn+1
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D
2nn
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Solution

The correct option is D 2nn+1
The above expression is nothing but
12x=1x=0[(1+x)n+(1x)n].dx
=12[(1+x)n+1(1x)n+1n+1]x=1x=0
=12(n+1)[2n+1+0(1n+11n+1)]
=2nn+1

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