A is 2.5 B is 7.8 I did this on a quiz and got 100% hope it helps
It is done by this formula
combinations = n! / [r! * (n - r)!]
combinations = 15! / [4! * 11!]
combinations = 15 * 14 * 13 * 12 * 11! / [4! * 11!]
combinations = 15 * 14 * 13 * 12 / 4 * 3 * 2
combinations = 15 * 7 * 13
combinations = 1,365
answer is b
Answer:
27 doesn't belongs to this group
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In mathematics, the reciprocal, or multiplicative inverse, of a number x is the number which, when multiplied by x, yields 1. It is denoted 1/x or x-1.
