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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...
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoIt 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.
Wiki User
∙ 11y agoThat is nearly the Fibonacci sequence; to make the Fibonacci sequence it needs a '3' between the '2' and the '5'
Wiki User
∙ 15y agoThe answer is 21, just add the previous two numbers.
Wiki User
∙ 15y ago2
Anonymous
21
Anonymous
18
Anonymous
24
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Which number should come next in the series 1-3-6-10-15-?
The next number is -21
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10
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225
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the answer will be 21
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This is the series of square numbers, (16= 4*4). The next number is 5*5=25.
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21
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21
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21.
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21
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A single number, such as 12848384 does not make a series.
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The next number is 25 but there are the sequence is infinite so there can be no end to the sequence.
look at this series 2,4,6,8,10 what number should come next?
12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50
