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04-12-2020
Mathematics

contestada

from a group of 6 dogs and 8 cats, in how many ways can 2 dogs or 2 cats be selected

Respuesta :

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04-12-2020

Answer:

420

Step-by-step explanation

First, we have 6*5 permutations of doges and 8*7 permutations of cats.

So we have 6*5*8*7 permutations of 2 doges and 2 cats.

However, since order doesn't matter we divide that by 2*1*2*1.

Therefore 6*5*8*7/4 = 420

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