Question: Please answer a,b, and c. Please show your calculations. I don't understand How many different five-digit numbers can be formed from the set of seven

Please answer a,b, and c. Please show your calculations. I don't understand

How many different five-digit numbers can be formed from the set of seven numbers {1, 2, 3, 4, 5, 6, 7} if a) repetition is allowed? b) repetition is not allowed? c) repetition is allowed and the third digit must be different from the second digit? Show your calculations. (6 marks: 2 marks for each part)

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