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