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Sum of N Terms of an AP

s n = 5n 2 +1...

Question

$s_{n} = {5 n}^{2} + 11 n$ Find $s_{5}$

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Solution

$s_{n} = 5 n^{2} + 11 n s_{5} = 5 (5)^{2} + 11 (5) s_{5} = 125 + 55 = 180$

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