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Write the formula of the sum of first n terms for an A.P. - Algebra

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Sum

Write the formula of the sum of first n terms for an A.P.

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Solution

Sum of the first n terms is given by

Sn = `"n"/2[2"a" + ("n" - 1)"d"]`,

where a = first term,

d = common difference

OR

Sn = `"n"/2("t"_1 + "t"_"n")`,

where t1 = first term,

tn = last term

Concept: Sum of First n Terms of an AP
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