If in the expansion of \[{{(1+x)}^{21}}\], the coefficients of \[{{x}^{r}}\] and \[{{x}^{r+1}}\] be equal, then r is equal to [UPSEAT 2004]

If in the expansion of \[{{(1+x)}^{21}}\], the coefficients of \[{{x}^

1.	If in the expansion of \[{{(1+x)}^{21}}\], the coefficients of \[{{x}^{r}}\] and \[{{x}^{r+1}}\] be equal, then r is equal to [UPSEAT 2004]
A.	9
B.	10
C.	11
D.	12
Answer» C. 11

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If in the expansion of \[{{(1+x)}^{21}}\], the coefficients of \[{{x}^{r}}\] and \[{{x}^{r+1}}\] be equal, then r is equal to [UPSEAT 2004]

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