(a) How many different positive three-digit whole numbers can be formed from the four digits 2, 6, 7, and 9 if any digit can be repeated?
(b) How many different positive whole numbers less than 1000 can be formed from 2, 6, 7, 9 if any digit can be repeated?
(c) How many numbers in part (b) are less than 680 (i.e. up to 679)?
(d) What is the probability that a positive whole number less than 1000, chosen at random from 2, 6, 7, 9 and allowing any digit to be repeated, will be less than 680?
a) Repetitions are allowed
b) Repetitions are allowed
Then
c) Numbers from to
Numbers from to
Numbers from to
Then numbers less than 680
d)
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