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Q: How many two digit numbers can be made using the numbers 1 2 4 5 and 7?

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a lot

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210

179 of them.

5040 numbers can be made.

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

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321 312 213 231 123 132 6 3 digit 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.

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24

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