Which term of the A.P. 3,10,17, ... will be 84 more than its 13th term?

Explanation

The given sequence is `3,10,17, .....`

with `a=3` and `d=10−3=7
`

Given `n^(th)` term is `84` more than its `136(th)` term

`=>t_n​=t_(13​)+84`

`=>a+(n−1)d=(a+12d)+84`
`=>(n−1)d=12d+84
`

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