Guess The Next Number in Series : 1 3 = 5 , 3 5 = 11 , 5 11 = 21 , 11 21 = ?

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Question :

Guess The Next Number in Series :

1   3  = 5 ,

3   5  = 11 ,

5   11  = 21 ,

11  21 = ?

Answer :

series sum = 2nd number + 2(1st number)
21+2(11) = 43
43

One thought on “Guess The Next Number in Series : 1 3 = 5 , 3 5 = 11 , 5 11 = 21 , 11 21 = ?”

  1. next number can be 39. follows the series plus 1 3 5 7 9 add each consecutive odd number to the sum of the addens 1 plus 3 = 4 plus 1=5. 3 plus 5= 8 plus 3=11. 5 plus 11 = 16 plus 5 =21. 11 plus 21 =32 plus 7 =39 (the next series is 21 plus 39=60 plus 9 =69

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