This question is based on Combination.
Part A: when the elevator operator cannot distinguish people.
Now there are 8 people and 6 floors and the number of floors keeps decreasing by 1.
so 8+6-1=13
applying combination ways.
Part 2: When the elevator operator identifies between men and women.
there are 5 men and 3 women.
Number of ways to select 5 men = 5+6-1 =10
Applying combination ways.
Number of ways to select women= 3+6-1=8
Applying combination ways
Total number of ways = 252*56 = 14112 ways.
When working out an equation, if the result comes out like : x = 2, or y = 4.....a variable equal to a number, then there is 1 solution
if the result comes out like : 0 = 4, or 2 = 6...no variable and an incorrect result, then the equation has no solutions because ur lines are parallel.
if the result comes out like : 2 = 2 or 5 = 5...no variable and a true statement, then there will be infinite solutions because ur lines are coincident...they are the same line
Step-by-step explanation:
A) d = a2-a1 = 5-9 = - 4
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The answer is (2,889 mi) hope it helps and have a great day!