If the coefficient of 4th term in the expansion of \[{{(a+b)}^{n}}\] is 56, then n is [AMU 2000]

If the coefficient of 4th term in the expansion of \[{{(a+b)}^{n}}\] i

1.	If the coefficient of 4th term in the expansion of \[{{(a+b)}^{n}}\] is 56, then n is [AMU 2000]
A.	12
B.	10
C.	8
D.	6
Answer» D. 6

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If the coefficient of 4th term in the expansion of \[{{(a+b)}^{n}}\] is 56, then n is [AMU 2000]

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