Read the word problem below. Chan rows at a rate of eight miles per hour in still water. On Wednesday, it takes him three hours
to row upstream from his house to the park. He rows back home, and it takes him two hours. What is the speed of the current? Which of the following is a clue that would help solve this word problem? The rate of Chan’s rowing in still water is 8 mph. Chan rows from the house to the park on Wednesday. Chan’s house is next to a river. The entire trip takes five hours.
Let a set of elements. We can find (factorial) of the element. However, combination of the element lead to less than possibilities. (combining like adding or multiplying) So the proposition is false.
elements. 
(factorial) of the