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# How many 4 digit numbers are there which contains not more than 2 different digits?

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- ?Lv 72 months ago
The anonymous answer is good apart from it should be 10,000 not 9,000 ie 0000 to 9999 and there are also other typos in it.

10,000 - (9 x 8 x 7 x 6) - (9 x 8 x 7) = 6472

- Anonymous2 months ago
9000 - (all different digits) - (3 different digits)

9000 - (9*8*7*9) - (9*8*9*6)

= 576

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