Question 371414: Find the sum of the first twenty terms of the sequence 3,5,7,........ Found 2 solutions by ewatrrr, jrfrunner:Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! In the sequence you provide each number changes by an "constant" value.
This is known as an arithmetic sequence
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The change, or is the difference between any two values, so in this case =2
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For an arithmetic sequence, the nth term =
and for an arithmetic series, its sum is defined as the average value times the number of terms or Sum=
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in the sequence you provide, =3 and the last term
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The sum = average value * n =