Question

The sum of 1+3+5+7+________+23

(A)81
(B)144
(C)143
(D)142

Answer 1

$given \: a = 3 \: \: d = 2 \: \: l = 23 \\ ^an = a + ( \: n - 1 \: ) \: d \\ = 23 = 3 + ( \: n - 1 \: ) \: 2 \\ = 23 = 3 + 2n - 2 \\ = n = 11. \: ^s11 = \frac{n}{2} ( \: a + 1 \: ) \: \\ = \frac{11}{2} ( \: 3 + 23 \: ) \: = \frac{11}{2} \times 26 = 143$
i hope this helps u............

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option C is correct answer