complete the series..
6,7,9,13,21,__
a)25
b)29
c)37
d)32...
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9-7=2
13-9=4
21-13=8
Since each time the difference is double of the previous difference,
So the next difference should be double of 8.
2*8=16
The next number in the series is =
21+16=37
The required number is (c) 37
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