Question: Please solve for me 3. Explain, by using and expanding the permutation formula, why P(n, n) is equal to n! [2] 4. How many arrangements

Please solve for me 3. Explain, by using and expanding the

Please solve for me

3. Explain, by using and expanding the permutation formula, why P(n, n) is equal to n! [2] 4. How many arrangements of five letters from the word certain contain the letter t? Explain your reasoning

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