Integars: (...-2, -1, 0. 1, 2...)
Natural numbers: (0, 1, 2....) NO NEGATIVES
postive: (1, 2, 3...) NO ZERO
even: (0, 2, 4) INCLUDES ZERO
Is that right?
God, permutations, combinations, and probablity are scaring me:
Combinations: pick 2 from a group of 10 =
10!/ [(10-2!)*2!]
Permutations: how many ways to order a group of 15 people
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