exam Maths Puzzle Numerical Ability

A) If 2 dice are thrown, find the probability that the numbers shown will be different.
B) If 3 dice are thrown, find the probability that the numbers shown will all be different.

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exam Other Question
a student has test scoresof 80, 82, 94, 71. what score does the student need on the next test to produce an average score of 85? Find the solutions to the equation: x-5/x=4