Next number of the sequence 1, 3, 7, 13, 21, ............ will be

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13 Aug 2012 sequence

Next number of the sequence
1, 3, 7, 13, 21, ............ will be

OPtion

1) 28
2) 30
3) 31
4) 33
5) 37
6) 39
7) 40
8) 41
9) 43
10) none of these

Solution

1 = 0^2 + 1
3 = 1^2 + 2
7 = 2^2 + 3
13 = 3^2 + 4
21 = 4^2 + 5
31 = 5^2 + 6

Correct Option: 3 Best Solution (0)