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The 19th term of an A.P. is equal to thr...

The 19th term of an A.P. is equal to three times its 9th term.If its `9th` term is 19, find the A.P.

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Let in an `A.P`. first term `=a` Common difference `=d`
`T_9 =19`
`a+8d=19−−−−(1)`
Given,
`T_9 =3T_6`
`=>a+18d=3(a+5d)`
`=>a+18d=3a+15d`
...
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