exam Maths Puzzle Numerical Ability

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability of two or three of the balls are white.

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exam Other Question

Can you please help me solve this problem...instructions...determine which two equations represent perpendicular lines.
(a)y=4/9x-3
(b)y=3x-4/9
(c)y=-1/3x+4/9
(d)y=1/3x-4/9 The perimeter of a rectangle is 3 more than three times its width.Find the length and width of the rectangle.