Hi there The formula of the future value of annuity due is Fv=pmt [(1+r)^(n)-1)÷r]×(1+r) Fv future value? PMT payment 9000 R interest rate 0.04 N time 75−51=24 years So Fv=9,000×((((1+0.04)^(24)−1) ÷(0.04))×(1+0.04)) =365,813.17
The sample space in the problem is 6 girls and 7 boys. If ten players are to be chosen composing of three or four girls, then for 3 girls:6C3 * 7C7 / 13C 10 = 0.06993 for 4 girls: 6C4 * 7C6 / 13C 10 = 0.3671 we add the two and the answer is 0.4371