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Question

The term independent of x in (1+x)m(1+1x)n is

A
m+nCm
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B
m+nCn
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C
m+nCmn
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D
None of these
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Solution

The correct option is C m+nCn
(1+x)m(1+1x)n
=(1+x)nxn.(1+x)m
=(1+x)m+nxn
Writing the general expression for any term in the above expansion.
Tr+1=m+nCrxr.xn
=m+nCrxrn
For term independent of x
rn=0
r=n
Hence the term is Tn+1 and the coefficient is
=m+nCn

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