# Formula for Core 2

Includes some statistics.

Useful for the front of your folder for reference,

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- Created by: Hope
- Created on: 19-11-08 16:43

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CORE 2

SEQUENCES

K = term

a1 = first term

an = last term

d = common difference

n = number of terms in sequence

r = common ratio

Arithmetic- same value added/subtracted each time

for the kth term ak = a + (k-1) d

or for the last term L = a + (n-1) d

sum of terms S = ½ n (a + L)

Geometric- multiplying terms by a fixed number, common ratio, or r

for the kth term ak = a r k-1

or for the last term an = a r n-1

sum of n terms Sn = a (1 rn )

(1r)

sum of infinite terms S = a

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