exam Maths Puzzle Numerical Ability

How do I write this expression in simplest form.

ab - 3a + 5b - 15/15 + 3a^2 - 5b - a^2b

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exam Other Question

Find the circumference of a circle whose radiusis 8 in. (Use pi.) Two numbers a and b, are randomly selected without replacement from the set {2,3,4,5,6,7}. What is the probability that the fraction a/b is lessthan 1 and can be expressed as a terminating decimal?
Could you please explain this, Please?