SOLUTION: the first term of an A.P is 7,the last term is 70 and sum is 385.find the number of terms in the series
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Question 1124731: the first term of an A.P is 7,the last term is 70 and sum is 385.find the number of terms in the series
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
The sum of an arithmetic progression is the number of terms, multiplied by the average of the first and last terms:
Plug in the given information:
There are 10 terms in the A. P.
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