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What is the sum of the last 5 terms of the series 1 9 17... 49?

User Asm
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2 Answers

1 vote
17,25,33,41,49
the sum of those numbers is 165
User ArtBelch
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7 votes
The series is increasing by 8 each time.

So that means the complete series is:
1, 9, 17, 25, 33, 41, 49

Add the last 5 digits:
49 + 41 + 33 + 25 + 17 = 165

Answer:
165
User Surfealokesea
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