Answer
$15$ ways
Work Step by Step
There are 6 total marbles, and there are two groups of indistinguishable colors (the groups have 4 and 2 marbles).
Therefore, the amount of ways the marbles can be arranged is $\frac{6!}{4!\times 2!}=15$ ways.
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 9, Counting and Probability - Section 9.1 - Counting - 9.1 Exercises - Page 658: 53
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