Find the $8^{t h}$ term of the A.P. : $11, 14, 17, 20.....$

11

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- 17

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17

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32

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Solution

The correct option is C $32$
Given series is $11, 14, 17, 20, . . . .$
Let the general form of A.P., $a_{n} = a + (n - 1) d$
Common difference, $d = 3$ and first term $a = 11$
$a_{8} = ?$
$a_{n} = a + (n - 1) d$
$a_{8} = 11 + (8 - 1) \times 3$
$a_{8} = 11 + 21$
$a_{8} = 32$

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