The range is from 6 to 18.
we are given
martians =4
plutonians =3
jupiterians=5
so, total number of seats =4+3+5=12
number of seating arrangement for martians is 4!
number of seating arrangement for plutonians is 3!
number of seating arrangement for jupiterians is 5!
total number of seating arrangement is 12!
so, we get
possible seating arrangements are

.............Answer
Answer:
162 ft^2
Step-by-step explanation:
18 * 18 = 324
324/2 = 162
The area of the patio is 162 square feet