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IF 1 = 2, 4 = 20, 6 = 42, 9 = 90 Then 10 =?

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IF 1 = 2, 4 = 20, 6 = 42, 9 = 90 Then 10 =?
posted Jul 23, 2014 by Kuldeep Apte

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2 Answers

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1 = 1*2 i.e. 2
4 = 4*5 i.e. 20
6 = 6*7 i.e. 42
9 = 9*10 i.e. 90
10 = 10*11 i.e. 110

answer Jul 30, 2014 by Ankit Bajpai
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answer is 110
n*(n+1)
10*11=110

answer Mar 9, 2016 by Nithi Mani
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