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Question
A box contains loo red cards, 200 yellow cards and 50 blue cards. If a card is drawn at random from the box, then find the probability that it will be not a yellow card
Solution
Total no. of possible outcomes = 100 + 200 + 50 = 350 {100 red, 200 yellow & 50 blue}
E ⟶ event of getting yellow card
No. of favourable outcomes = 200 {200 yellow}
Probability = `"No.of favorable outcomes"/"Total no.of possible outcomes"`
P(E) = 200/350 = 4/7
`barE`⟶ event of not getting yellow card
𝑃(`barE`) = 1 − 𝑃(𝐸)
= 1 − 4/7 = 3/7
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