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

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

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