exam Maths Puzzle Numerical Ability

x^2 -6x -27<0

(x-9)(x+3)<0

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exam Other Question

Use either the fundamental counting principle or the permutation formulas (or both) to answer the following:

In how many different ways can you arrange the letters of the word COMPUTER taking 4 at a time?

Find the sum. Express the answer in simplest form.

-6g^2+9/h^2-2 + 7g^2-6/h^2-2