There are 31 guests at your home for a dinner party. In how many ways could the guests arrange themselves on a four person couch
1 answer:
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For this case we have the following system of equations:
To solve, we clear "x" from the second equation:
We substitute "x" in the first equation:
We clear the value of the variable "y":
We look for the value of the variable "x":
Thus, the solution of the system is given by:
Answer:
Option D