If the $n^{t h}$ term of an A.P., is $(2 n + 1),$ then the sum of its first three terms is(a) 6n+3 (b) 15 (c) 12 (d) 21

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Levi Discussed

If the

n^{t h}

term of an A.P., is

(2 n + 1),

then the sum of its first three terms is(a) 6n+3 (b) 15 (c) 12 (d) 21

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Question Text

If the

n^{t h}

term of an A.P., is

(2 n + 1),

then the sum of its first three terms is(a) 6n+3 (b) 15 (c) 12 (d) 21

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