exam Maths Puzzle Numerical Ability

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In how many ways can three numbers be selected from the set {1,3,4,6,7,8,11} so that the sum of the three numbers is even? In how many ways can three

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Why does y=3 represent a function, but x=3 does not? Find f(x+h)-f(x)/h where f(x)=x^2+4x+5