exam Maths Puzzle Numerical Ability

how do i go about solving the following problem?
find the indicated values. h(1), h(3) and h(4)

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exam Other Question

Hi! I need help solving

(x^-2+y^-2)/(xy+x^-2y^-2)

Thanks for the help in advance!
3) Use the geometric sequence of numbers 1, 1/3, 1/9 , 1/27… to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
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