SOLUTION: The first and last term of the arithmetic progression are 3 and 21 respectively and the sum of the series is 240. Find the number of terms.
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Question 818833: The first and last term of the arithmetic progression are 3 and 21 respectively and the sum of the series is 240. Find the number of terms.
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
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