According 5963

The numbers are arranged according to a specific logical order. What number should be in the blank a, b?
3, 7, 15, a, 63, 127, b

Correct answer:

a =  31
b =  255

Step-by-step explanation:

n2 =  2n1 + 1 a=2 15+1=31
b=2 127+1=255



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