th term of AP 3, 8, 13, 18,...... is 78.

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Solution

The correct option is A 16
Given, the $n^{t h}$ term of the AP = 78
The common difference(d) = 5
The first term(a) = 3

The $n^{t h}$ term of AP is,
$T_{n} = a + (n - 1) d$
$\to 78 = 3 + (n - 1) 5$
$\to n = 16$

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