If 9 th term of an AP is zero prove that its 29 th term is twice the 19 th term.

Answers (1)
S safeer

given a+8d=0

implies a=-8d

a29=a+28d=-8d+28d=20d.......(1)

a19=a+18d=-8d+18d=10d.......(2)

From (1) and (2) it is clear that 

a29=2a19

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