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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 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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