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Q: How many 6 digit numbers can be formed form the digits 123456 if no digits can be repeated?

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6*6*3 = 108 numbers.

Assuming no repeated digits, lowest first, 20; in any order 120; Allowing repeated digits: 216

1 set

48 of them if digits may not be repeated. 100 if they can.

There are 5! = 120 such numbers.

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6*6*3 = 108 numbers.

192 ways

Assuming no repeated digits, lowest first, 20; in any order 120; Allowing repeated digits: 216

500

24

There are 5*4*3 = 60 such numbers.

5040 different 4 digit numbers can be formed with the digits 123456789. This is assuming that no digits are repeated with each combination.

If the digits may not be repeated, there are 6x5x4x3x2x1 = 720 numbers, If digits can be repeated, the answer is 6x6x6x6x6x6 = 46,656 numbers If zero is ong the available digits but is excluded from the first place. 5x6x6x6x6x6=38,880 numbers

1 set

It is 120 if the digits cannot be repeated.

3x3x3=27

27 if the digits can be repeated. 6 if not.

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