MATHEMATICS

Arithmetic

Reference to a Specific Number

Using Common Difference

Formula

r

An=A1+(n-1)d

How Many?

Formula

r

Sn=n/2 (A1+An)

Total?

Fibonacci

1,1,2,3,5,8,13,21,34,55,...

Add to the Previous

Series

The totality

Sn=n/2(A1+An)

Harmonic

Inverse of A.S.

Sequence

Finite Sequence

has a

Starting Number

Difference or Factor

Fixed Total Number of Terms

Infinite Sequence

terms

It is not fixed

grows to INFINITY

Geometric

Formula

r

An=A1*rn-1

Use Common Ratio

MEANS

a middle point or something (as a place, time, number, or rate) that falls at or near a middle point

Check the MEMO!!!