exam Maths Puzzle Numerical Ability

24x^4y^2/3x^8y^2

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f(0)=1; f(x) decreases by 3 when x increases y 1 If f(x)={(3,5), (2,4), (1,7)} and h(x)= {(3,2), (4,3), (1,6)} then what is f(h(4))?