Wednesday, December 30, 2009

What is the formula for this sequence of numbers?

The formula for the series 2, 5, 8, 11 is 3n-1.





What is the formula for the series 2, 4, 8, 16, 32?What is the formula for this sequence of numbers?
The first one: S_n = (n/2)(a_1 + a_n)





The second one: S_n = (a_1 (1 - r^n)) / (1 - r)What is the formula for this sequence of numbers?
the formula is 2^n.
2n





2(2)=4


2(4)=8


2(8)=16


2(16)=32
2^n

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