Ananya loves even numbers, so she came up with a game to play with her friend So in order to expose her to even numbers. Ananya and So each select, independently and uniformly at random, a number from [1...2n], where n is a positive integer. We call these numbers a and b respectively. Ananya is very happy when either the sum or the product (or both) of a and b is even. Define events X = “a + b is even,” Y = “a · b is even.” Help Ananya out by determining whether X and Y are independent. Prove your answer.

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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Ananya loves even numbers, so she came up with a game to play with her friend So in order
to expose her to even numbers. Ananya and So each select, independently and uniformly at
random, a number from [1...2n], where n is a positive integer. We call these numbers a and b
respectively. Ananya is very happy when either the sum or the product (or both) of a and b is
even. Define events X = “a + b is even,” Y = “a · b is even.” Help Ananya out by determining
whether X and Y are independent. Prove your answer.

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