exam Maths Puzzle Numerical Ability

In a middle school it has 500 lockers, all are closed. Five hundred students start down the hall. The fist student opens every locker. The second student closes all lockers that ar

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exam Other Question
is c+(a+b)=(a+b)+c an example of the commutative property? is (a*b)c=a(b*c) also an example of commutative property? (y+3)/(y-3)

(y^2-9)/y^2-5y+6

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