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Show that the sequence is an A.P. if its...

Show that the sequence is an A.P. if its nth term is linear expression in `n` and in such a case the common difference is equal to the coefficient of `ndot`

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a/c let `Tn =an+c` is a linear equation where a is coefficient of n and c is constant
first of all we put n=1
`T1=a+c` put `n=2`
`T2=2a+c` put `n=3`
`T3=3a+c` ...
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