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Q: How many 3 digit numbers can be made using the digit 6 7 8 8?

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a lot

2

210

9

179 of them.

5040 numbers can be made.

120 5-digit numbers can be made with the numbers 12345.

-- If the same digit may be repeated, then 64 can be made. -- If the same digit may not be repeated, then 24 can be made.

20 of them, if repetition is not allowed.

If you can repeat a digit, there are 27. If you can't repeat a digit, there are only 6.

66

15

10,000

2304

24

9^9 = 387420489 different digit combinations.

1,956 different numbers can be made from 6 digits. You can calculate this by using the permutation function in a summation function, like this: Σ6k=1 6Pk = 6P1+6P2+...+6P5+6P6 What this does is calculate how many 1 digit numbers you can make from 6 digits, then how many 2 digit numbers can be made from 6 digits and adds the amounts together, then calculates how many 3 digit numbers can be made and adds that on as well etc.

10

There are 4 possible numbers if the digits are not repeated; 18 if they are. Those are 3-digit numbers, assuming that zero would not be a leading digit. If zero is allowed for a leading digit, then you can have 6 for the non repeated, and 27 if repetition.

-24686

There are 60480 numbers.

Number of 7 digit combinations out of the 10 one-digit numbers = 120.

Six.

6*5*4*3=360

120 combinations using each digit once per combination. There are 625 combinations if you can repeat the digits.