Raffle tickets numbered consecutively from 101
350 are placed in a box. What is the
Probability that a ticket selected at random will
Have number with a hundreds of 2?
What is the combined area, in square inches, of the front and back of a rectangular sheet of paper measuring 8'2 inches by 11 inches?
举报
一些彩票被标上数字(连续的 从101到350)问随机取一张票,其中数字百位为2的概率为多少?
200/350=4/7
第二个没写全
从101到350 共有350-101+1=250个数
其中以2为百位的有299-200+1=100个
所以百位为2的概率为100/250=2/5
第二题
长×宽×2即可
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