If the 9 term of an AP is zero then show that the 29 term is twice the 19 term
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Step-by-step explanation:
a+8d=0
a=-8d
a+(29-1)d=2(a+(19-1)d)
-8d+28d=2(-8d+18d)
20d=2(10d)
20d=20d
proved
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