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प्रश्न
A bag contains 5 black, 7 red and 3 white balls. A ball is drawn from the bag at random. Find the probability that the ball drawn is not black
उत्तर
Total no. of possible outcomes = 15{5 black, 7 red & 3 white balls}
E ⟶ event of drawing black ball
No. of favourable outcomes = 5 {5 black balls}
P (E) =5/15 =1/3
`barE`⟶ 𝑒𝑣𝑒𝑛𝑡 𝑜𝑓 𝑛𝑜𝑡 𝑑𝑟𝑎𝑤𝑖𝑛𝑔 𝑏𝑙𝑎𝑐𝑘 𝑏𝑎𝑙𝑙
P `(barE)`= 1 − 𝑃(𝐸)
= 1-(1/3) =2/3
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