exam Maths Puzzle Numerical Ability

Evaluate b2 - 2bc + c2 if b = 3 and c = -2

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exam Other Question

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? Excercise 4-8
Using the eighteen valid arguement forms, prove the following arguements are valid. (These proofs are very basic. None require more than six additional lines to comp