Answer
First
Work Step by Step
The first number in every row of Pascal's triangle is 1.
The first number in the nth row is $\binom{n}{0}=\frac{n!}{0!\times(n-0)!}=\frac{n!}{n!}=1$.
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.4 The Binomial Theorem - 14.4 Exercise Set - Page 921: 3
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