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Q: How many 3 digit numbers can be formed using the digits 1 to 7?

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There are 60480 numbers.

There are 900 of them.

27

27 if the digits can be repeated. 6 if not.

More than one

48 of them if digits may not be repeated. 100 if they can.

24 different numbers.

If repetition of digits isn't allowed, then no13-digit sequencescan be formed from only 5 digits.

Using the digits of 1345678, there are 210 three digit numbers in which no digit is repeated.

6

Possible solutions - using your rules are:- 11,13,17,31,33,37,71,73 &77

the largest five digit number that can be formed using the digits 7 and 9 is 97,000

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