book Maths Puzzle Numerical Ability

Slove the Problem:
the matching section of an exam has 5 questions and 8 possible answers in how many different ways can a student answer the 5 question, if none of the answer choices can be repeated?

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book Other Question

i want to know how we solve this problewhat is the quantity of a profit of 250 dollars 3(x+y)^2+4(x+y)-6, when x= 4, and y = -1