Answer
See below.
Work Step by Step
The possibilities are: $AB,AC,AD,AE,AF,BC,BD,BE,BF,CD,CE,CF,DE,DF,EF$ thus we have $15$ possibilities.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11824 - 11.6 - Counting Principles - 11.6 Exercises - Page 824: 57
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