Question

If 9th term of an AP is zero, show that 29th term is twice its 19th term

Answer 1

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Answer 2

a+8d=0; a= -8d
____________
a+28d= 2 (a+18d)
-8d+28d=2 (-8d+18d)
20d=2 (20d)
20d=40d
therefore ,
a29=2(a19)