Six women and five men walk into an appliance store at the same time. There are five salesperson available to help them.Find the probability that a salesperson will first help at least 2 women.
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we define the total number of men and women = (5+6) = 11
we define (11C5) = 462
let X be the number of women to be helped first
p(x≥2) = 1 - ( P(x=0) + P(x=1) )
we define p(x=0) = ( (6C0) * (5C5) ) / (11C5) = 1/462
we define p(x=1) =( (6C1) * ( 5C4) ) / (11C5) = 30/462
Thus p(x≥2) = 1 - ( (1/462) + (30/462) )
= (431/462) = 0.932900432