A five-digit number is formed from the digits 0,1,2,3,4,5,6. Each digit can be used only once.
How many of these are odd numbers?
MATHS 急!!!
2008-11-10 7:11 pm
回答 (1)
2008-11-10 7:29 pm
✔ 最佳答案
1. End with 1 and start with 2,3,4,5 or 6, so there are 3 numbers in the middle and chose among 5 numbers(including 0), so total permutation = 5 x 5P3 = 5 x 5 x 4 x 3 = 300.2. For odd number, it could end with 3 and 5 also. So total = 300 x 3 = 900.
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