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What number comes next in this series- 1, 2, 3, 6, 9, 8, 7, ?

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What number comes next in this series- 1, 2, 3, 6, 9, 8, 7, ?
posted Apr 8, 2017 by Maninder Bath

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1 Answer

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This is what I observed
The first 2 terms are taken as 1,2
Now for the third term 1+2 = 3.
For the 4th term = 1+2+3 = 6.
For the 5th term though we must take the sum of only the last 2 terms again as we did for the 3rd term
So 5th term = 6 + 3 = 9.
6th term = 9 + 6 + 3 = 18 ===> 8 [ only units place is retained ]
Now for the 7th term, again we have to take the sum of only the last 2 terms => 8 + 9 = 17 = 7.

Finally the answer is 9 + 8 + 7 = 24 ===> 4

answer Apr 8, 2017 by Tejas Naik
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