Posted by **Lucas** on Sunday, February 3, 2013 at 12:05pm.

The sum of the first n terms of a sequence is given by 4-4(1/2)^n.calculate the first 3 terms

- Maths and science -
**Reiny**, Sunday, February 3, 2013 at 12:31pm
term(1) = 4 - 4(1/2)^1 = 4 - 2 = 2

term(2) = 4 - 4(1/2)^2= 4-4(1/4) = 3

term(3) = 4-4(1/2)^3

= 4 - 4(1/8)

= 4 - 4/8

= 4 - 1/2 = 3 1/2 or 7/2 or 3.5

so to get any term, e.g. term(5), replace n with the term number you want, in this case n=5

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