Suppose a, ne Z and 0 < a

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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Suppose a, ne Z and 0 < a <n. Prove that
n-
(1)-(^=¹)+(21)
a
n-
a-
in two different ways: firstly using the formula for (2) in terms of factorials; and secondly by consid-
ering subsets of {1,..., n}.
Transcribed Image Text:Suppose a, ne Z and 0 < a <n. Prove that n- (1)-(^=¹)+(21) a n- a- in two different ways: firstly using the formula for (2) in terms of factorials; and secondly by consid- ering subsets of {1,..., n}.
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