Mathematics: Gmat if a group of 3 is to be chosen from a group of 6, how many different groups are possible?

Gmat if a group of 3 is to be chosen from a group

Ответ:

alleahbethea199

24.05.2020

The number of combinations of taking "r" items from a group of "n" is found by the formula:
combinations = n! / [r! * (n-r)!]
combinations = 6! / 3! * 3!
combinations = 6 * 5 * 4 * 3! / 36
combinations = 20

Source:
http://www.1728.org/combinat.htm

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Ответ:

brandyjune9546

20.08.2022

Mathematics

$B. \: \frac{8}{3}$

Step-by-step explanation:

${2}^{7} = {8}^{5 - x} \\ {2}^{7} = {2}^{3(5 - x)} \\ {2}^{7} = {2}^{15 -3 x} \\ .......since \: the \: bases \: are \: the \: same, \: then \: equate \: thier \:powers \\ \\ 7 = 15 - 3x \\ 3x = 15 - 7 \\ x = \frac{8}{3} .$

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Gmat if a group of 3 is to be chosen from a group of 6, how many different groups are possible?

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