1.

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

Answer»

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



Discussion

No Comment Found

Related InterviewSolutions