1.10^50-74 is written as an integer in base 10 notation,what is the sum of the digits in that integer?
A 424 B 433 C 440 D 449 E 467
不明白这个题是什么意思 谢谢高人指教
2.是说照相六个人排两排 按高低个从左到右，第二排的每个人都必须比第一排的对应的高 有多少种排法 答案是5
3.does the dicimal equivalent of P/Q ,where P and Q are positive integers ,contain only a finite number of nonzero digits?
(1)P>Q
(2)Q=8 答案是E 可我认为B就可以搞定了呀 请高人指教 | 
