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hntnhtthnyt
03.12.2020 •
Mathematics
The principal would like to assemble a committee of 7 students from the the 11 member student council. How many different committees can be chosen?
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Ответ:
Step-by-step explanation:
Remark
This problem only wants to know how many ways to select 7 starting from a base of 11.
Nothing else matters. Not grades, not gender, not age, not qualifications, not order -- nothing. Just 7 out of 11.
That problem is a combination and is written as
(11)/(7)
The formula used is
11! / (7! (11 - 7)! )
11! /( 7! 4!) = 11 * 10 * 9 * 8 * 7! / (7! * 4!) The 7! s cancel out
11 * 10 * 9 * 8 / 4 * 3 * 2 * 1 = 330
Ответ:
q = -10.
Step-by-step explanation:
5 = 2(q + 10) - -5
5 = 2q + 20 + 5
5 - 20 - 5 = 2q
-20 = 2q
q = -20/= -10.