Question

What is the common difference of an A.P. in which a

a21-a7
= 84 ?

Answer 1

a21 - a7 =84
a+20d-a-6d =84
14d=84
d=6

Answer 2

hii, see(a+20d)-(a+6d)=84
soo,a+20d-a-6d=84
14d=84
d=6

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