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If the 9^(th) terms of an A.P is zero ,...

If the `9^(th)` terms of an A.P is zero , prove that `29^(th)` term is double the `19^(th)` term .

Text Solution

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`a+8d=0rArra=-8d`
`a_(29)=a+28d=-8d+28d=20d`
`a_(19)=a+18d=-8d+18d=10d`
`thereforea_(29)=2.a_(19)`
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