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General Form of an AP

Find the 15...

Question

Find the $15^{t h}$ term of the A.P. $19, 23, 27, 31, 35, 39, . . . 156$

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Solution

$a = 19 d = 4 a_{15} = a + 14 d = 19 + 14 (4) = 75$

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