In the following question, select the missing number from the given series.
3, 4, 5, 4, 9, 10, 6, 16, 15, 9, 25, 20, 13, 36, ?
The given series is a combination of three series with a gap of 2 letters between them which are :
I : 3 , 4 , 6 , 9 , 13
II : 4 , 9 , 16 , 25 , 36
III : 5 , 10 , 15 , 20
The missing letter is after 36, so it's part of the third series. Clearly, next letter in this series =Â 25
=> Ans - (B)
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