If the 9th term of an AP is 0,prove that its 29th term is twice its 19

1.	If the 9th term of an AP is 0,prove that its 29th term is twice its 19th term
Answer» Case1:a9=0 a+8d=0 a=-8d Case2:a29=a+28d =(-8d)+28d =20d And a19=a+18d =(-8d)+18d =10d Then,A29 /a19=20d/10d =2Hence,a29 is twice of a19.

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