There are 35 students are in the classroom  20 girls and 15 boys  two students selected randomly  find the given probabilities 1- first is boy and secound is girl 2 both are boys 3- both are girls

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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There are 35 students are in the classroom 

20 girls and 15 boys 

two students selected randomly 

find the given probabilities

1- first is boy and secound is girl

2 both are boys

3- both are girls 

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