2. 职称英语
  3. If a three-digit number is selected at random from the integers 100 to 999, incl

If a three-digit number is selected at random from the integers 100 to 999, incl

游客2024-01-14  68
问题 If a three-digit number is selected at random from the integers 100 to 999, inclusive, what is the probability that the first digit and the last digit of the integer will both be exactly two less than the middle digit?
选项 A、1:900
B、7:900
C、9:1,000
D、1:100
E、7:100
答案 B
解析 There are exactly 7 digits out of the 900 for which this statement is true: 131, 242, 353, 464, 575, 686, 797; that equals a probability of 7 out of 900.
转载请注明原文地址:https://www.tihaiku.com/zcyy/3360437.html
相关试题推荐
随机试题
最新回复(0)