exam Maths Puzzle Numerical Ability

25. solve for n if P(n,3)=2C(n,2),n � N

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exam Other Question

A radioactive isotope has a half-life of 3000 years. If a sample of this isotope origanally has a mass 30g, what equation would model the mass of this sample over time? What would its mass be after 5 hours? 3x+y=21
10x+5y=65