Total no. of possible outcomes = 100 + 200 + 50 = 350 {100 red, 200 yellow & 50 blue}
(i) E ⟶ event of getting blue card.
No. of favourable outcomes = 50 {50 blue cards}
P(E) = 50/350 = 1/7
(ii) E ⟶ event of getting yellow card
No. of favourable outcomes = 200 {200 yellow}
P(E) = 200/350 = 4/7
Bar E⟶ event of not getting yellow card
P(Bar E)=1−P(E)
= 1−4/7 = 3/7
(iii) E ⟶ getting neither yellow nor a blue card
No. of favourable outcomes = 350 – 200 – 50 = 100 {removing 200 yellow & 50 blue cards}
P(E) = 100/350 = 2/7