book Maths Puzzle Numerical Ability

graph y=tanx for x between -3pie/2 and 3pie/2, and then reflect the graph aboutthe line y=x to obtain the graph of x=tany

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book Other Question

How many different ways can 13 different runners finish first, second and third place in a race? How can you solve this equation when in class we are working on permutaions and combinations as well as probabitly. (4,1),(2,3)