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In the sequence of numbers 4,7,-7.., each even term is 3 more than the previous and odd term is -1 times the previous... [CLOSED]

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In the sequence of numbers 4,7,-7,....., the first term is 4. Each even numbered term is 3 more than the previous term.Each odd numbered term after the first is -1 times the previous term. What is the sum of the first 22 terms?

closed with the note: solved
posted Mar 2, 2017 by Mayukh Bose

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1 Answer

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Answer is 11.
The series follows like this:
4, 7 , -7, -4, 4, 7, -7, -4, 4, 7, -7, .....
All terms get cancelled other than 4 & 7.
So 4+7=11.

answer Mar 3, 2017 by Vigneshvari
Thanks...
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