exam Maths Puzzle Numerical Ability

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?

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exam Other Question

This problem is not in the book.
15/x - 15/x+2 =2 Can you help me solve this? Thanks Rhee x^2 -6x -27<0

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