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If 9t h term of an A.P. is zero, prov...

If `9t h` term of an A.P. is zero, prove that its `29 t h` term is double the `19 t h` term.

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`T_(9)=0Rightarrow a+8d Rightarrow a=-8d `
` T_(19)=a+8d =-8d+18d =10d and T_(29) =a+28d =-8d +28d =-8d +28d =20d`
`T_(29) = 2xx T_(19)`
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