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
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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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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?
Transcribed Image Text: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?
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