Exam Maths Puzzle Algebra

How many 5-number license plates can be made using the digits 1, 2, 3, 4, 5, 6, 7 if repetitions are allowed? not allowed?

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Exam Other Question

Q3. Simple interest and compound interest for a certain sum of money is Rs 600 and R 648 respectively for two years. What is the rate of interest? Find the absolute value of each complex number

1. 6i

2. 9

3. -4 - 3i