from a set of : 0,3,4,5,6,7
how many three digit natural numbers can be written, where, at least two digits must be the same?
answer is 80 but i can not get there
i said 5 possibility for first digit, then take the next equal, then another 6 possibility, so 5x6 = 30, and we have 5 situations like this so it makes 5x30=150 but the answer is given as 80
how many three digit natural numbers can be written, where, at least two digits must be the same?
answer is 80 but i can not get there
i said 5 possibility for first digit, then take the next equal, then another 6 possibility, so 5x6 = 30, and we have 5 situations like this so it makes 5x30=150 but the answer is given as 80