5. How many 3-digit numbers can be formed from the digits 0,3,4,5,6 and 7 if(repetition is allowed) all the numbers formed are less than 700.
Added by Anna H.
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Since the number has to be less than 700, the hundreds digit can only be 0, 1, 2, 3, 4, 5, or 6. So there are 7 choices for the hundreds digit. Show more…
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