Question

How many 3-digit numbers can be formed sing the digits 0,1, 2, 3, 4, 5, 6, if repetitions are not allowed?
however 180 can't be the answer i checked? any one know how to solve this one
permutations = 7!/4! = 7*6*5 = 210
but does beginning with 0 count like 012 ?

210 was my choice answer and I got it wrong
10 in the ones column
* 9 in the tens column
* 7 in the hundreds column if 0 not allowed
90*7 = 630 ?

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