The sum of the first four terms of an A.P. is 56 and the sum of the first eight terms of the same A.P. is 176. Find the sum of the first 16 terms of the A.P.?

The sum of the first four terms of an A.P. is 56 and the sum of the first eight terms of the same A.P. is 176. Find the sum of the first 16 terms of the A.P.?

• A. 646
• B. 640
• C. 608
• D. 536

 

The correct answer is option C. 608. Can you explain this answer in the comments?

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