ImmortalFusedZamasu ImmortalFusedZamasu

02-07-2018
Mathematics

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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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jdoe0001 jdoe0001

02-07-2018

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.

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