exam Maths Puzzle Numerical Ability

How many four-digit numerical codes can be created if no digit may be repeated?

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exam Other Question

Solve the equation:

y^2 - 3y - 18 over y^2 - 4 divided by y^2 + 5y + 6 over y - 2 Please help me solve 2x+y=5 so I can graph it I have an idea but not sure.