a) Two balls are drawn at random in succession without replacement from a box containing 8 black and 5 red balls. Find the probability that (i) both balls are red. (ii) First ball is black and second is red. b) In a group of 6 boys and 4 girls, four children will be selected. How many different methods can be chosen so that it contains three boys and one girl?
a) Two balls are drawn at random in succession without replacement from a box containing 8 black and 5 red balls. Find the probability that (i) both balls are red. (ii) First ball is black and second is red. b) In a group of 6 boys and 4 girls, four children will be selected. How many different methods can be chosen so that it contains three boys and one girl?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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