A box contains 2" tickets of which nC, tickets bear the number r (r= 0, 1, 2... n). Two tickets are drawn from the box. Find the expectation of the sum of their numbers.

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 box contains 2" tickets of which nC, tickets bear the number r (r= 0, 1, 2 .
n). Two tickets are drawn from the box. Find the expectation of the sum of their
numbers.
Transcribed Image Text:A box contains 2" tickets of which nC, tickets bear the number r (r= 0, 1, 2 . n). Two tickets are drawn from the box. Find the expectation of the sum of their numbers.
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