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There is a box with 5 red balls and 3 blue balls. What is the probability of drawing a red ball at random? A. 3/8 B. 5/8 C. 3/5 D. 5/3 相关知识点: 试题来源: 解析 B。本题考查概率的计算。总共有 5 个红球和 3 个蓝球,总数为 8 个球。随机抽取一个红球的概率是红球的数...
BLUE BALLS FOR THE RED STATES.Presents excerpts from the teaching materials for federally funded high-school abstinence programs, collected for a report commissioned by Representative Henry Waxman (D-Calif.).EBSCO_AspHarpers Magazine
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In a bag, there are red and blue balls in the ratio of 3:4. If there are 12 red balls, how many blue balls are there? A. 16 B. 9 C. 20 D. 18 相关知识点: 试题来源: 解析 A。解析:设蓝色球数量为 x,12/x=3/4,解得 x=16。
A bag containing 5 red and 3 blue balls. If 3 balls are drawn at random without replacement the probability that exactly two of the three balls were red, the first being red is View Solution An urn contains 6 red and 5 blue balls. Two balls are drawn at random with replacement. Find...
There are three red balls and two blue balls in a box. If you randomly pick one ball and then put it back, and then pick another ball. What is the probability that both balls are red? A. 1/2 B. 3/5 C. 9/25 D. 3/10 相关知识点: ...
codeforces 399B. Red and Blue Balls 解题报告 题目链接:http://codeforces.com/problemset/problem/399/B 题目意思:给出 n 个只由 R 和 B 组成的字符串(由上到下排列,相当于栈),问最多可以操作多少轮。一轮包括三个步骤:(1)如果栈顶的球为 red,则弹出(注意可以弹出多个),直到遇到栈顶的球为blue (...
Step 1: Identify the total number of balls in the bagThe bag contains:- 3 red balls- 4 blue balls- 1 yellow ball To find the total number of balls, we add these together:Total number of balls=3+4+1=8 Step 2: Determine the total number of possible outcomesThe total number of possi...