求问一道数学代数题:324,700和458600之间十位数是一且个位数是3的整数？

serenaxiaoxiao

how many integers between 324,700 and 458,600 have tens digit 1 and units digit 3?  
　(a) 10.300  
　(b) 10.030  
　(c) 1.353  
　(d) 1.352  
　(e) 1.339  
本题答案为E。
新东方黄皮书上的解答是4586-3247=1339，看不懂呀！求高人指点，感激不尽！呜呜！

sdcar2010

The first or smallest one is 324713.
The last or biggest one is 458513.

Then it is like counting from 1 to 100: (100-1)+1 = 100

In this case counting from 324713 to 458513: (4585-3247) + 1 = 4586-3247