candy2tall candy2tall

01-12-2016
Mathematics

contestada

Suppose that a class contains 15 boys and 30 girls, and that 10 students are to be selected at random for a special assignment. Find the probability that exactly 3 boys will be selected.

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thatasian thatasian

01-12-2016

15C3 x 30C7 / 45C10 = 455 * 2035800 / 3190187286
926289000 / 3190187286 = 0.29035568
= about 29%

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