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The four numbers 1, 2, 3 and 4 can be used to form many four digit numbers without repetition. What is the sum of all these four digit numbers? Write the formula (preferably comprehensive), the answer, fast! Kneel down for the answer!
4! = 24
Each number appears six times in thousands, hundreds and tens
So the sum is 6666 (1 + 2 + 3 + 4) = 66660
A number is made up of 9 ones and 5 percentages. The number is ()
9500
How many numbers can be composed of the four numbers 0, 1, 2 and 3
Single digit: 4
Double digit: 3x3 = 9
Three digits: 3x3x2 = 18
Four digit: 3x3x1 = 18
So, there are 49
How many numbers are larger than 240135 and can be composed of the six numbers 0.1.2.3.4.5?
Starting with 5, there are 5 * 4 * 3 * 2 * 1 = 120; starting with 4, there are 5 * 4 * 3 * 2 * 1 = 120; starting with 3, there are 5 * 4 * 3 * 2 * 1 = 120; starting with 25, there are 4 * 3 * 2 * 1 = 24; starting with 245, there are 3 * 2 * 1 = 6; starting with 243, there are 3 * 2 * 1 = 6; starting with 241, there are 3 * 2 * 1 = 6; starting with 2405, there are 2 * 1 = 2; starting with 2
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