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321 312

213 231

123 132

6 3 digit numbers.

Q: How many 3 digit numbers can be made using 3 2 1?

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210

5040 numbers can be made.

-- 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.

24

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.

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a lot

2

210

5040 numbers can be made.

9

You can make 4*3*2/2 = 12 numbers.

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

-- 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.

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

It is: 9C7 = 36

66

10,000