Find what comes next?

1,2,3,5,8,13,21,_

25 34 51 43

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6 solutions

Munem Shahriar
Apr 6, 2017

Relevant wiki: Fibonacci Sequence

1+2 = 3

3+2 = 5

5+3 = 8

8+5 = 13

13+8 = 21

21+13 = 34

Ans. 34

Mohammad Khaza
Jul 21, 2017

this is a Fibonacci sequence. so,

1+2 = 3

3+2 = 5

5+3 = 8

8+5 = 13

13+8 = 21

21+13 = 34

Ans. 34

Karthi Keyan
Oct 16, 2015

1+2=3 2+3=5 3+5=8 5+8=13 8+13=21 13+21=34

Ashish Menon
May 31, 2016

It follows the fibonacci sequence giving the answer as 13 + 21 = 34 13 + 21 = \color{#69047E}{\boxed{34}} .

Achille 'Gilles'
Oct 20, 2015

It is part of the Fibonacci sequence where you add the two preceding number to get the next.

F n _{n} = F n 1 _{n-1} + F n 2 _{n-2}

...

1+2 = 3

2+3 = 5

3+5 = 8

5+8 = 13

8+13 = 21

13 + 21 = 34 \boxed{ 13+21 = 34 }

21+34 = 55

...

Cuauhtemoc Chacon
Oct 20, 2015

fibonacci where?

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