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Use 0,1,2,3,4,5 to form the number without repetition. (1) how many four digit numbers can be formed; (2) how many four digit numbers can be formed (2) How many four digits can be divided by 5? (3) How many odd and even numbers can be composed of four digits arranged alternately.
three hundred
First, there are five choices: 1, 2, 3, 4 and 5
Second, there are five
Third, there are four
Fourth, there are three
So, 5 * 5 * 4 * 3 = 300
Use 0123456789 ten numbers to form two five digit numbers, how to combine the product to the maximum?
96521 * 87430= 8438831030
How to make up a three digit number and a two digit number with the five numbers of 2, 3, 4, 5, 6? How to make up the maximum product?
642,53
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