SOLUTION: the number of ways in which a man can invite one or more of his 8 friends to dinner
Algebra.Com
Question 773503: the number of ways in which a man can invite one or more of his 8 friends to dinner
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
He can have 1 friend for dinner
He can have 2 friends for dinner
He can have 3 friends for dinner
and so on up to
He can have 8 friends for dinner
----------------------------
In each of these 8 cases, use the
formula for where is
the number of friends invited
to dinner. Note that you don't use
permutations since the order of
the invited friends doesn't matter
----------------------------
So, the solution is:
etc. up to
-----------------
-----------------
---------------
Continue up to and add up
all the results.
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