A box contains 5 green, 4 yellow and 3 white balls. Three balls are drawn at random. What is the probability that they are not of same colour.
Total cases & equals; 12C3 = 12 × 11 × 10 3 × 2 × 1 = 220 Total cases of drawing same colour = 5C3 + 4C3 + 3C3 = 5 × 4 × 2 × 1 + 4 + 1 = 15 Probability of same colur = 15 220 = 3 44 Probability of not same colur = 1 − 3 44 = 41 44
Total cases & equals; 12C3 = 12 × 11 × 10 3 × 2 × 1 = 220 Total cases of drawing same colour
= 5C3 + 4C3 + 3C3 = 5 × 4 × 2 × 1 + 4 + 1 = 15
Probability of same colur = 15 220 = 3 44
Probability of not same colur = 1 − 3 44 = 41 44
1297 MCQ for effective preparation of the test of Probability of Word Problems section.
Read the MCQ statement: A box contains 5 green, 4 yellow and 3 white balls. Three balls are drawn at random. What is the probability that they are not of same colour. , keenly and apply the method you have learn through the video lessons for Probability to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 148-12915.