exam Maths Puzzle Numerical Ability

If the product 3/2.4/3.5/4.6/5....a/b = 9. what is the sum of a and b?

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exam Other Question
Solve the system of equations:
9^(3x-y)=(1/81)^-1
(sqrt5)^(2x-y)=1 how do i find the premutation on 13 p 8