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30 without repetition (6P2)

66 with repetition (12C2)

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Q: How many different two digit numbers can you form using the digits 1 2 5 7 8 and 9 with repetition?
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How many two digit numbers can you form using the digits 1235679 with repetition allowed?

You have seven different digits (symbols) to choose from, so you can form seven different one digit numbers and 7×7=72=49 different two digit numbers.


Where d represents a digit from 0 9 how many different ISBN numbers are possible if repetition of digits is allowed?

There are 10 to the 10th power possibilities of ISBN numbers if d represents a digit from 0 to 9 and repetition of digits are allowed. That means there are 10,000,000,000 ISBN numbers possible.


How many 13 digit numbers are possible by using the digits 12345 which are divisible by 4 if repetition of digits is not allowed?

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


How many 3 digit number can be made using the digits 2 4 7 9?

24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.


How many three digit numbers can be formed using the digits 873 and 6 without repetition?

I take it that you want to make three digits numbers with 8,7,3, and 6 without repetition. The first digit cane be selected from among 4 digits, the second from 3 digits, the third digit from 2, hence the number of three digit numbers that can be formed without repetition is 4 x 3 x 2 = 24


How many 3 digit numbers are possible from the digits 012345?

Assuming that the first digit can't be zero: If repetition of digits is permitted: (5 x 6 x 6) = 180 numbers of 3 digits. If repetition of digits is not permitted: (5 x 5 x 4) = 100 numbers of 3 digits.


How many 3 digit numbers can be formed from the digits 1234?

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How many 4-digit numbers are possible if the hundreds digit is 8 and if repetition of digits is allowed?

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How many 4 digit numbers can be made to give the sum of 6?

If repetition of digits is allowed, then 56 can.If repetition of digits is not allowed, then only 18 can.


How many different two digit numbers can be formed using the digits 2 3 5 6 8?

20 of them, if repetition is not allowed.


How many different 3 digit number can be formed from 13579 if there's repetition?

As there are 5 different digits, allowing for repetition of a digit, the first digit can be any of the 5, and for each of these, the second can be any of the 5, and so for the third, making: 5 x 5 x 5 = 125 different 3-digit numbers.


How many 2-digit numbers can be produce using the digits 123456789 if repetition is not allowed?

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