A combination lock has 20 numbers on it, from zero to
19. The combination to unlock it consists of four
numbers.
Find the probability that the combination contains the numbers 1,
2, 3, and 4 in some order, assuming that
numbers cannot be repeated in the
combination.
Write your answer as a simplified fraction.
If numbers cannot be repeated in the
combination, then the probability that the combination contains the
numbers in some order is ________.
Find the probability that the combination contains the numbers
1, 2, 3, and 4 in some order, assuming that
numbers can be repeated in the
combination.
Write your answer as a simplified fraction.
If numbers can be repeated in the
combination, then the probability that the combination contains the
numbers in some order is __________.
