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carolinc
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permutation
selecting more than one item WITHOUT replacement and order is IMPORTANT

combination
selecting more than one item WITHOUT replacement and order is NOT IMPORTANT

What is the difference between with and without replacement?
 With replacement means the same item can be chosen more than once.
 Without replacement means the same item cannot be selected more than once.

What is an intersection?
 The Intersection of two sets is the overlap of the sets;
 what they both have in common.
A intersect B = { x  x A and x B }

What is a union?
The Union of two sets consists of all elements in A or B or BOTH.

What is mutually exclusive?
nothing in common

