If coefficients of 2nd, 3rd and 4th terms in the binomial expansion of \[{{(1+x)}^{n}}\] are in A.P., then \[{{n}^{2}}-9n\] is equal to [RPET 1999; UPSEAT 2002]

If coefficients of 2nd, 3rd and 4th terms in the binomial expansion of

1.	If coefficients of 2nd, 3rd and 4th terms in the binomial expansion of \[{{(1+x)}^{n}}\] are in A.P., then \[{{n}^{2}}-9n\] is equal to [RPET 1999; UPSEAT 2002]
A.	-7
B.	7
C.	14
D.	-14
Answer» C. 14

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If coefficients of 2nd, 3rd and 4th terms in the binomial expansion of \[{{(1+x)}^{n}}\] are in A.P., then \[{{n}^{2}}-9n\] is equal to [RPET 1999; UPSEAT 2002]

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