Zoho Probability Quiz 1

Question 1

Time: 00:00:00
A box contains 2 white balls, 3 black balls and 4 red balls. 
In how many ways can 3 balls be
drawn from the box, if at least one
black ball is to be included in the draw?

64

64

75

75

98

98

100

100

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Question 2

Time: 00:00:00
A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles.
If two marbles are picked at random, what is the probability that they are
either blue or yellow?

5/21

5/21

2/21

2/21

6/21

6/21

9/21

9/21

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Question 3

Time: 00:00:00
A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles. 
If three marbles are picked at random, what is the probability that they are
all blue?

1/91

1/91

1/455

1/455

2/64

2/64

3/85

3/85

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Question 4

Time: 00:00:00
A box contains 3 blue marbles, 4 red, 6 green marbles and 2 yellow marbles.
If four marbles are picked at random, what is the probability that none is
blue?

51/61

51/61

52/98

52/98

33/91

33/91

17/91

17/91

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Question 5

Time: 00:00:00
A box contains nine bulbs out of which 4 are defective. If four bulbs are
chosen at random, find the probability that exactly three bulbs are good.

20/63

20/63

98/65

98/65

36/25

36/25

91/85

91/85

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Question 6

Time: 00:00:00
A basket has 5 apples and 4 oranges. Three fruits are picked at random.
The probability that at least 2 apples are picked is -.

25/42

25/42

36/42

36/42

71/25

71/25

69/65

69/65

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Question 7

Time: 00:00:00
A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously,
the probability that both are of the same colour is -.

8/15

8/15

2/5

2/5

11/15

11/15

7/15

7/15

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Question 8

Time: 00:00:00
If six persons sit in a row, then the probability that three particular persons 
are always together is -.

4/5

4/5

6/5

6/5

2/5

2/5

1/5

1/5

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Question 9

Time: 00:00:00
If a card is drawn from a well shuffled pack of cards, the probability of
drawing a spade or a king is -.

19/52

19/52

4/13

4/13

9/26

9/26

17/52

17/52

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Question 10

Time: 00:00:00
 If four coins are tossed, the probability of getting two heads and two tails
is -.

2/6

2/6

3/8

3/8

3/5

3/5

3/7

3/7

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Sample space for four time tossing is 2^4=16

Getting two heads and two tails can happen in six ways. n(E) = six ways p(E) = 6/16 = 3/8

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