A child’s game has 8 triangles of which 3 are blue and rest are red, and 10 squares of which 6 are blue and rest are red. One piece is lost at random. Find the probability that it is a

(i) triangle

(ii) square

(iii) square of blue colour

(iv) triangle of red colour

Total number of figures

n(S) = 8 triangles + 10 squares = 18

(i) P(lost piece is a triangle) = 8/18 = 4/9

(ii) P(lost piece is a square) = 10/18 = 5/9

(iii) P(square of blue colour) = 6/18 = 1/3

(iv) P(triangle of red colour) = 5/18

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