The coefficient of \[{{x}^{m}}\] in \[{{(1+x)}^{m}}+{{(1+x)}^{m+1}}+......+{{(1+x)}^{n}},m\le n\] is

The coefficient of \[{{x}^{m}}\] in \[{{(1+x)}^{m}}+{{(1+x)}^{m+1}}+..

1.	The coefficient of \[{{x}^{m}}\] in \[{{(1+x)}^{m}}+{{(1+x)}^{m+1}}+......+{{(1+x)}^{n}},m\le n\] is
A.	\[^{n+1}{{C}_{m+1}}\]
B.	\[^{n-1}{{C}_{m-1}}\]
C.	\[^{n}{{C}_{m}}\]
D.	\[^{n}{{C}_{m+1}}\]
Answer» B. \[^{n-1}{{C}_{m-1}}\]

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The coefficient of \[{{x}^{m}}\] in \[{{(1+x)}^{m}}+{{(1+x)}^{m+1}}+......+{{(1+x)}^{n}},m\le n\] is

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