`(5+13+21+…+181)=?`A. 2476B. 2337C. 2219D. 2139 – InterviewSolution

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1.	`(5+13+21+…+181)=?`A. 2476B. 2337C. 2219D. 2139
Answer» Correct Answer - D Let the number of terms be n. Then, `T_(n) = 181` `therefore 5 + (n-1) xx 8 = 181 rArr (n-1) xx 8 = 176 rArr (n-1) = 22 rArr n = 23.` `therefore "sum" = (n)/(2)(a+l) = (23)/(2)(5+181) = 23 xx 93 = 2139`

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