SOLUTION: The 16th term of an A.P. is 40 and the sum of the first 5 terms is 5. Find the sum of the first 50 terms.
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Question 1054074: The 16th term of an A.P. is 40 and the sum of the first 5 terms is 5. Find the sum of the first 50 terms.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
1.
.
.
2.
Subtract eq. 1 from eq. 2,
So then,
So then the sum is,
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