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Study the pattern and complete the series - 4, 9, 20, 43, ?

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Study the pattern and complete the series - 4, 9, 20, 43, ?
posted Nov 13, 2017 by Ankur Athari

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1 Answer

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4*2=8+1=9
9*2=18+2=20
20*2=40+3=43
So on

answer Nov 13, 2017 by Satish Pradhan
The next number is 90
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