Question

Which of these shows a way to order and group the
factors 3, 5, and 6 to find the product?
3X (5X6)→3 X 30 = 90
(3 X 6) X5-18 X 5 =90
(5X3) X5-15 X 5 = 75
6x (3X5)→6 X 15 =90
3x (5x5) →3 X 25 = 75