book Maths Puzzle Numerical Ability

what is permutation? Find all these things for a set having 4&5 elements?

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book Other Question

A medium sized pizza is 9" in diameter and costs $6.80. A large sized pizza is 12" in diameter and costs $9.95. What is the difference in the price per square inch between a medium and a large pizza? Round your answer to the nearest cent. say you have the equation y = x^3 - 3. How would you solve the y-intercept, the x-intercept and the vertex to this equation?