Three fair coins are tossed at the same time. What is the probability that all three coins will come up heads or all will come up tails?
Why is it useful to carry enough 25-cent coins with you?
Why, according to the passage, did ancient Chinese coins have a square hole in the center?
Why, according to the passage, did ancient Chinese coins have a square hole in the center?
Three coins are tossed at the same time. What is the probability that exactly two heads are face up?
Three coins are tossed at the same time. What is the probability that exactly two heads are face up?
A jar contains 30 coins, of which 20 are nickels and 10 are dimes. If 7 coins are removed, how many nickels are left?
(1) More nickels are removed than dimes.
(2) The remaining coins in the jar are worth $1.55.