Maths Dictionary

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Multiplication principle - used when there are two operations or events (say, A and B) where one event is followed by the other

"If there are n ways of performing operation A, and m ways of performing operation B, then there are n*m ways of performing A and B"

Addition principle - used when are two operations or events that occur in which one event is not followed by the other

"If there are n ways of performing operation A., and m ways of performing operation B, then there are n+m ways of performing A or B"

Arrangement - selection where order is important

n factorial or n! - the of ways in which n distinct objects may be arranged where:

n! = n (n-1) (n-2) (n-2) ... 3 * 2 * 1

0! = 1

1! = 1