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21 It is the Fibonacci secuence.1+1=2 1+2=3 2+3=5 and so on... 1,1,2,3,5,8,13,21,34,55,89,144,233,377,610...

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15y ago
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15y ago

It is called the Fibonacci sequence. The third term can be found by adding the first and second, the fourth by adding the second and third, and so on.

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12y ago

That is nearly the Fibonacci sequence; to make the Fibonacci sequence it needs a '3' between the '2' and the '5'

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16y ago

The answer is 21, just add the previous two numbers.

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16y ago

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Anonymous

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4y ago

21

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4y ago

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4y ago

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