Math, asked by kiwikiwi498, 1 year ago

What is the common difference of an AP in which a21 _a7=84

Answers

Answered by goelavanal

3

Answer.

a21=a+20d.......1

and a7 =a+ 6d.........2

A/Q

a21_a7=84

From 1 and 2

(a+20d)_(a+6d)=84

14d=84

d=84/14

d=6

Therefore here d = 6

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