An urn contains n m balls, of which n are red and m are black. They are withdrawn from the urn, one at a time and without replacement. Let x be the number of red balls removed before the first black ball is chosen. We are interested in determining e[x]. To obtain this quantity, number the red balls from 1 to n. Now define the random variables xi , i

just find the gcf and solve the gcf's until you get each answer i have a really good feeling somethings missing xd (like the dimensions of the fence) *cough *cough *hint *hint

step-by-step explanation:

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

50-60=10

step-by-step explanation:

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