exam Maths Puzzle Numerical Ability

This is also put in simplest form. HELP
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exam Other Question

Simpliflying Square Roots
How to simply these:
1. 5 * 30
2. 64/48
3. 75
4. 35/7 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?