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How many ways can you choose a manager and assistant from 7-person task force? *​
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How many ways can you choose a manager and assistant from 7-person task force? *​

User Golem
by
3.3k points

1 Answer

8 votes
We are interested in selecting 2 people from the 7-person task force.

n = 7
r = 2

nPr = n! / (n-r)!

7!
------
(7-2)!

=
7!
----
5!

7×6×5×4×3×2×1
------------------------
5×4×3×2×1

= 7×6

= 42
User Superjer
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