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Q: How many different 2 digit numbers can you form using the digits 1 2 3 5 6 7 and 9 with repetition allowed?

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64 if repetition is allowed.24 if repetition is not allowed.

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

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

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.

20 of them, if repetition is not allowed.

-123456787

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.

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.

125

10^7 if the repetition of digits is allowed. 9*8*7*6*5*4*3 , if the repetition of digits is not allowed.

290

-4

64 if repetition is allowed, 6 otherwise.64 if repetition is allowed, 6 otherwise.64 if repetition is allowed, 6 otherwise.64 if repetition is allowed, 6 otherwise.

125 There are five choices for each of the three digits (since repetition is allowed). So there are 5*5*5=125 combinations.

There are 676,000 ways to make the license plates.

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

It is 415968.

If repetition is allowed [such as 122 or 555], then there are 5Â³ = 125 possibilities.

30 without repetition (6P2) 66 with repetition (12C2)

Just six numbers... 345, 354, 435, 453, 534 & 543

There are 2000 such numbers.

5040

10 30 80

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.

9 odd numbers less than 100 can be formed. They are: 3,5,7,35,37,53,57,73 and 75.