Q.

The coefficient of 6th  term in the expansion of (1+x)8

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a

54

b

56

c

58

d

62

answer is B.

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Detailed Solution

n = 8Tr+1=Cr   8xrAccording to problem coefficient of 6th term T6=T5+1=C5   8x5∵ Coefficient of 6th  term is 8C5=56
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