if 9th term of an A.P is zero, prove that its 29 term is double of its 19 term
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a+8d=0
a=-8d
to prove
a+28d=2(a+18d)
solve it
28d=a+36d
a+36d-28d=0
a+8d=0......given
so proved
a=-8d
to prove
a+28d=2(a+18d)
solve it
28d=a+36d
a+36d-28d=0
a+8d=0......given
so proved
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