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Please Help?? What is the sum of the last four terms of the series 7 + 9 + 11 + ..... + 21? A. 72 B. 40 C. 112
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3 votes
Please Help??

What is the sum of the last four terms of the series 7 + 9 + 11 + ..... + 21?

A. 72

B. 40

C. 112

User GodsCrimeScene
by
5.9k points

1 Answer

5 votes
well, if you notice, is just an arithmetic sequence, is adding 2 to get the next term.

so the last term is 21, so the one before that has to be 21-2 or 19, and the one before that 17 and the one before that 15.

15+17+19+21.
User Halsafar
by
5.8k points
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