? = 21⁄25 × 20⁄9 × 5⁄12 ÷ 17⁄10 = 119⁄90 = 129⁄90
What should come in the place of the question mark(?) in the following equation?
21⁄25 ÷ 9⁄20 × 5⁄12 ÷ 10⁄17

a) 7 77⁄125
b) 11 9⁄10
c) 119⁄450
d) 1 29⁄90
e) None of these