Math, asked by pulakg2006, 9 months ago

what is the common difference of an AP in which a²¹-a⁷=84? please solve and send pic.

Answers

Answered by GoelChayank

0

Answer:

a²¹-a⁷=84

{a+(21-1)d}-{a+(7-1)d}=84

{a+20d}-{a+6d}=84

a+20d-a-6d=84

20d-6d=84

14d=84

d=84/14

d=6

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