The number of ways in which one or more balls can be selected out of 10 white, 9 green and 7 blue balls is
(a) 892 (b) 881 (c) 891 (d) 879 (e) None of these
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A bag contains 5 white balls and 7 red balls. If 5 balls are drawn at random, the probability that 3 balls are red and the rest are white.
The answer is 175/396
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Given 5 different green dyes ,four different blue dyes and three different red dyes,the number of combinations of dyes which can be chosen
Green dyes =5 Blue dyes =4 Red dyes =3 The no of ways of choosing of at least one green and one blue is =(25−1)×(24−1)×23 ⇒(32−1)×(16−1)×8 ⇒31×15×8 ⇒3720
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From 5 different green balls, four different blue balls and three different red balls, how many combinations of balls can be chosen
Total combination of balls = 212 Combination of balls with no green balls = 27 Combination of balls with no blue balls = 28 Combination of balls with no blue balls and no green...
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A box contains 1 red and 3 identical white balls. Two balls are drawn at random in succession without replacement
It is given that the box contains 1 red ball and 3 identical white balls. Let us denote the red ball with R and a white ball with W. When two...
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What is the probability that a number selected from the number 1 to 10 is not a prime number when each number is equally likely to be selected?
Total non-prime numbers from 1 to 10 = 6 Required probability =6/10=3/5
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A number x is selected at random from the numbers 1, 2, 3 and 4. Another number y is selected at random from the numbers 1, 4, 9 and 16.
x can be any one of 1, 2, 3 or 4. y can be any one of 1, 4, 9 or 16 Total number of cases of product of x and y...
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In a box there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?
(e) If the drawn ball is neither red nor green, then it must be blue, which can be picked in 7C1 = 7 ways. One ball can be picked from...
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Examine the following statements regarding a set of balls 1. All balls are black 2. All balls are white
(a) According to the given statements, only statement 1 and 4 can both be true because there may be a situation, when all the balls are black (1) or it...
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There are some balls of red, green and yellow colour lying on a table. There are as many red balls as there are yellow balls.
(b) According to question R = y and y = 2G ∴ R = 2G Hence, the number of red balls is double the number of green balls.
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If cloud is called white, white is called rain, rain is called green, green is called air, air is called blue,
(D) Blue Birds fly in air and air is called blue.
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