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A bowl contains 10 blue balls and 10 green balls. A girl selects balls at random without looking at them. ( by using pigeonhole principle)  (i) How many balls must she select to be sure of having at least three balls of the same colour? (ii) How many balls must she select to be sure of having at least three green balls?

A bowl contains 10 blue balls and 10 green balls. A girl selects balls at random without looking at them. ( by using pigeonhole principle)  (i) How many balls must she select to be sure of having at least three balls of the same colour? (ii) How many balls must she select to be sure of having at least three green balls?

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.8: Probability
Problem 32E
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A bowl contains 10 blue balls and 10 green balls. A girl selects balls at random without looking at them. ( by using pigeonhole principle) 
(i) How many balls must she select to be sure of having at least three balls of the same colour?
(ii) How many balls must she select to be sure of having at least three green balls?

 

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