You put the four digit number at the top of the three digit number and you do the same thing as you would do with a two digit number with a 3 digit number.
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60. There are 5 different choices for the first digit, four for the second digit, and three choices for the third digit. According to the fundamental counting principle, you multiply them together to get the total number of possible ways, and 5 x 4 x 3 = 60 Another way to think about it is 5!/3!
> 9999876 Actually, 9999876 has four different digits (6, 7, 8, 9). The largest 7-digit number with three different digits is 9999987.
1634, 8208 and 9474 See related link.
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