Acomputer retail store has 8 personal computers in stock. a buyer wants to purchase 3 of them. unknown to either the retail store or the buyer, 3 of the computers in stock have defective hard drives. assume that the computers are selected at random. (a) in how many different ways can the 3 computers be chosen? (b) what is the probability that exactly one of the computers will be defective? (c) what is the probability that at least one of the computers selected is defective?

Lian is deciding which of two gyms to join. each gym charges a monthly rate plus a one-time membership fee. lian correctly wrote and solved a system of linear equations by substitution to compare the costs of the memberships. in her work, she substituted an expression for one variable and solved for the other. this resulted in the equation 75 = 75. what can lian conclude? one gym charges $75 per month. each gym charges $75 per month both gyms charge the same monthly rate and the same membership fee. both gyms charge the same monthly rate, but not the same membership fee.