Natasha was asked to guess four different letters of the alphabet. She matched the exact same letters as you did in no particular order. You told her that it was pretty hard to do because there are  ways to do that.

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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Decide the number of possibilities of the given situation:

b) Natasha was asked to guess four different letters of the alphabet. She matched the exact same letters as you did in no particular order. You told her that it was pretty hard to do because there are  ways to do that.

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