https://www.gregmat.com/quizzes/quiz/im-overwhelmed-arithmetic-progress-quiz-1 (Question 9)
if 6! == 5! * 6 then wouldn’t it be equal rather then 6! is bigger (option b)
Quantity A: 5 \cdot 5! = 5(120)
Quantity B: 6! = 6 \cdot 5! = 6(120)
Why would they be equal?
Well
6! = 6×5×4×3×2×1
5! × 6 = (5×4×3×2×1) 6
So 6!=720
5! = 120 and 120×6= 720
Quantity A is 5 \cdot 5! and not 6 \cdot 5!. That seems to be the issue here, right?