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If a number can be proportional to 1, 2, 3, the number is
1：2=3：6
1：3=2：6
3：2=1.5：1
So this number is 1.5 or 6
How many double digits are there in 0.1.2.3
12, 10,11,12,13,20,21,22,23,30,31,32,33
How many non duplicate two digits can be made up of 1.2.3.4?
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- 1. The number of repeats allowed is 3
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- 10. How many combinations of three digits are there? The answer is 225,
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- 16. Among the ten numbers from 0 to 9, choose any four numbers to form the maximum number and the minimum number. For example, choose 1, 3, 7 and 8, and the maximum number is 8731 The smallest number is 1378. Then subtract the two numbers, and recombine the four numbers of the result into a maximum number and a minimum number, and subtract them again. "8731-1378 = 73537533-3357 = 4176" in this repeated process, can you find a mysterious number?
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