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Question

The 2nd and 50th term of an A.P is 49 and 89 respectively. Find the sum of first 51 terms of the given A.P.



Your Answer
A

3158

Correct Answer
B

3519

Your Answer
C

3258

Your Answer
D

3458


Solution

The correct option is C

3519


Let the first term and the common difference of the given A.P. be a and d respectively.

a+d = 49

a+49d =89

Sum of first 51 terms(51/2)(2a+50d)=3519

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