Answer
78 gifts
Work Step by Step
We are given the sequence:
$1,2,3,4,5,... 12$
The sum would be:
$1+2+3+4+...+12$
This is an arithmetic sequence with $a_1=1$ and
$a_{12}=12$. Thus the sum is:
$S_{12}=\frac{12}{2}(1+12)=6*13=78$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 8, Sequences and Series - Section 8.2 - Arithmetic Sequences - 8.2 Exercises - Page 608: 77
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