Question
A bag contains 4 orange balls, 5 black balls, and 6 pink
balls. If 3 balls are taken out randomly, what is the probability that all the three balls are not of the same colour ?Solution
ATQ,
Number of ways in which the person can pick three balls out of 15 balls = ¹⁵C₃ = 455 Number of ways of picking 3 balls of same colour = ⁴C₃ + ⁵C₃ + ⁶C₃ = 4 + 10 + 20 = 34 Probability of picking three balls of same colour = 34 / 455 Required probability = 1 – Probability of picking three balls of same colour = 1 – 34/455 = 421/455
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...Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
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W _ _ C H S _ _ T C _ ...
986 : 53 : : 725 : ?
Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series.
B _ M _ V B Q M _ V _ _ _ F V
Five words are given in the options and taking four letters of each of the words as specified, different words can be obtained and one of them is not an...
Two different positions of the same dice are shown. Which number will be at the top if 4 is at the bottom?
Select the option that is related to third cluster in the same way first cluster is related to second cluster.
PRAYER: 77 :: MALLOW : ?
