Question 1
A bag contains 4 red, 6 white and 5 black balls. One ball is drawn. Find the probability that it is not white.
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Non-white = 4 + 5 = 9 out of 15 → 3/5 Or: 1 − 6/15 = 3/5.
Question 2
A number is chosen at random from 1 to 30. Find the probability that it is divisible by 4.
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4, 8, 12, 16, 20, 24, 28 → 7 numbers → 7/30
Question 3
A letter is chosen at random from the word PROBABILITY. Find the probability that it is a vowel.
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PROBABILITY has 11 letters; vowels are O, A, I, I → 4 P = 4/11