book Maths Puzzle Numerical Ability

What is the equation of the perpendicular bisector of the line between the points (2,2) and (6,6).

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book Other Question

Why is 10 to the zero power 1. A bowl contains 50 colored marbles, 13 Green, 10 Red, 9 Blue, 8 Yellow, 6 Black, 4 White. If you are blindfolded, what is the smallest number of marbles you must pick to guarantee that you have at least 7 marbles of the same color?