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in Mathematics by (71.3k points)

It A and B are coefficients of xr and xn-r respectively in expansion of (1+x)n then =_____

(a) A+B = n 

(b) A=B 

(c) A+B = 2n 

(d) A-B = 2n

1 Answer

+1 vote
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Best answer

Correct option: (b) A=B

Explanation:

Coefficient of terms equidistance from beginning and end are same as

hcr = ncn–r 

∴ if A & B are coefficient of xr and xn–r then

A = B

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