Find the nth term of the AP given by 9, 13, 17, 21, 25, ....

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Solution

Here,
$F i r s t t e r m, a = 9$
$C o m m o n d i f f e r e n c e, d = 13 - 9 = 4$
$n t h t e r m = a + (n - 1) d$
$a_{n} = 9 + (n - 1) \times 4$
$a_{n} = 4 n + 5$

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