SOLUTION: How many seven digit numbers are there when 0 and 7 cannot be the leading number?
Algebra.Com
Question 1050878: How many seven digit numbers are there when 0 and 7 cannot be the leading number?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
there are digits from to
when and cannot be the leading number, then there is choices for the digit and they are: , ,, , , , , and
there will be choices for of the remaining digits, and we have:
or, you can do it this way:
Position: st.. nd ..rd.. th.. th.. th ..th
choices........ ........... ...............
total number of choices:
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