SOLUTION: if repetation is not permited then the six digit us 1,2,3,4,5,7 then how many ways are less than 4000?

Question 918490: if repetation is not permited then the six digit us 1,2,3,4,5,7
then how many ways are less than 4000?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
If repetition is not allowed, using the six digits 1, 2, 3, 4, 5, and 7,
we can make sequences of 4 digits.
Each of the six digits used has equal chance of being the first digit,
and since of those digits are less than 4,
half of the 4-digit numbers formed will be less than 4000.
That makes 4-digit numbers that are less than 4000.

If the number of digits does not matter, using the six digits 1, 2, 3, 4, 5, and 7,
you can make 1-digit numbers,
2-digit numbers, and
3-digit numbers,
for a total of
numbers that are less than 4000.

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