Step-by-step explanation: permutation is different from combination because in a permutation the order you put it in matters. in a combination any order is fine. So there is only one combination you can make with these numbers, but there is 120 permutation you can make.
I know it's late but, 25 ft ÷ 4 cm = 6.25 500 ÷ 6.25 = 80 750 ÷ 6.25 = 120 and so your answer is C.<span> 80 centimeters by 120 centimeters and again sorry it's late :D</span>