There are 42 ways to exit the mall if the mall has four escalators, one elevator, and three stairwells to travel from the second floor to the first floor.
A permutation can be defined as the number of ways a set can be arranged, order matters but in combination the order does not matter.
There are four escalators, one elevator, and three stairwells to travel from the second floor to the first floor.
Total ways to travel from second floor to first floor = C(8, 1) = 8
Total ways to travel from first floor to exit gate = C(6, 1) = 6
Total ways to exit from the mall = 8×6 = 42
Thus, there are 42 ways to exit the mall if the mall has four escalators, one elevator, and three stairwells to travel from the second floor to the first floor.
Learn more about permutation and combination here:
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