states that if two events are independent, the chance of both events occurring is the product of the separate chances.

one member of a group that makes up a set.

a number which combined with its inverse results in the identity 1, e.g. 4 × ¼ = 1.

a sequence in which each term is the sum of the previous two terms. The sequence starts 1; 1; 2...

an angle that is measured upwards from the horizontal plane.

a straight line that touches a curve at exactly one point.

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