Source: the probability class April 14,2021

Is the answer 945/16,387

R = red shirt

O = any other shirt

Now U can have RRRROOO, OOORRRR and so onβ¦ SO 7C4 combinations

Now probability of wearing red is 1/4 ,So not red = 1-1/4 = 3/4

So β> 35 x (1/4)^4 x (3/4)^3 = ANS

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yeah, the same. Just wanted to make sure I got it right.