What is 2.5.9.15.24.37.55!
2.5.9.15.24.37.55
One series difference: 3,4,6,9,13,18
Two series difference: 1,2,3,4,5
So the next two series difference is 6
The next difference is 18 + 6 = 24
The next number is 55 + 24 = 79
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