please show all work on PAPER!

Answer each of the following question with full clear explanations. 1. Evaluate: + 0! (3 marks: 1 for reducing, 2 for evaluating factorials) 2. How many 4 letter arrangements can be made from the letters MILK ED ? (2 marks for the correct number of arrangements) 3. How many different 6 - digit numbers can be formed from the numbers 2 5 6 2 7 2 ? (2 marks: 1 for the permutation set up, 1 for evaluating factorials) 4. Using the letters from the word C U S H I O N: a) How many 5 letter arrangements are possible? Express your answer as a whole number. (1 mark) b) How many 7 letter arrangements are possible if "C" must be the first letter and the letters "I" and "N" must be together? Briefly explain your calculations. (2 marks - answer and explanation)