How many length-5 binary strings contain exactly two 1s? How many length-5 ternary strings over E = {0, 1, 2} contain exactly two 2s? Let S CZ with |S| = n. What is the maximum value of |{a + b : a, b E S ^ a 7 b}|?

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
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How many length-5 binary strings contain exactly two 1s?
How many length-5 ternary strings over E = {0, 1, 2} contain exactly two 2s?
Let S CZ with |S| = n. What is the maximum value of |{a + b : a, b ES A a # b}|?
Transcribed Image Text:How many length-5 binary strings contain exactly two 1s? How many length-5 ternary strings over E = {0, 1, 2} contain exactly two 2s? Let S CZ with |S| = n. What is the maximum value of |{a + b : a, b ES A a # b}|?
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