5.9 What is the probability of the following events? (a) The sum of all the angles of a triangle is equal to 180°. (b) All 4 sides of a square are equal. (C) The sum of 2 negative integers is positive. (d) Two parallel lines are intersecting at a point.
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(a) = 1 (the sum of the angles of a triangle is always 180°)
(b) = 1 (All the sides of a square are always equal)
(c) = 0 ( the sum of two negative integers can never be positive. Eg: -1 + -3 = -4)
(d) = 0 ( two parallel lines can not intersect at all )
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