For an A.P, first term a = 5 and Common difference d = 3. Find the sum of first 8 terms.___

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Solution

Sum of first n terms, s
$= \frac{n}{2} (2 a + (n - 1) d)$

$= \frac{8}{2}$ $(2 \times 5 + (8 - 1) \times 3)$
= 4(10 + 21)
$= 31 \times 4$
= 124

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For an A.P, first term a = 5 and Common difference d = 3. Find the sum of first 8 terms.

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