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1. Use 2,0,4,9,7,1, and 5 to form the largest odd number .
答案為何會是 9754201 而 不是 9754210 呢 ?

2. Use 6,1,5,7,2,9 and 3 to write out the smallest even number

答案為何會是 1235796 而 不是 1235679 呢 ?

3. Write out the smallest 7-digit odd number .

答案為何會是 1000001

4. Write out the largest 8-digit even number

答案為何會是 99999998
5.Write out the largest 6-digit even number

答案為何會是 999998