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Q: What number comes next in the series 18-9-11-14-7-9-12?

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One number does not make a sequence (nor a series).

10

57

11 comes next.

There is no series of number: just one very large number!

10

mcmlx

It is: 4554

15-30 is next

The series seems to be "add 3," so the next number in the series would be 12 followed by 15.

The number that comes next in the series 1 2 2 5 3 10 is 7. You get this number by subtracting the number 3 from the number 10.

The next number is 49+8 = 57

A single number cannot define a sequence, even less a series.

0.01215

18

26

This series is of the function f(x) = x2+1, starting with x=0.The next number in the series is 26. The number after that is 37.

17 cause it is the next prime number

The next number is the sequence 236175969, 48, 12 is 236175861.

67

4

132

9

It is: 3663+891 = 4554

A series is a set of partial sums of sequences of numbers. A single number, such as 135, does cannot define a series.