A child's game has 8 triangle of which 3 are blue and rest are red, and 10 square of which 6 are blue and rest are red. One piece is lost at random. Find the probability that it is a
(i) trinagle (ii) square
(iii) square of blue colour
(iv) triangle of red colour

Explanation

Total number of figures
n(S)=8triangle+10square=18
(i) P(lost piece is a trianlge)=`(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)`