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Probability – 1 – 1

1. Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls. Find the probability that both balls are red ?

(a) 8/81
(b) 16/81
(c) 20/81
(d) 40/81

ANSWER

EXPLANATION

2. Two cards are drawn at random and without replacement from a pack of 52 playing cards. Find the probability that both the cards are black ?

(a) 7/109 
(b) 6/109
(c) 10/102
(d) 25/102

ANSWER

EXPLANATION

3. A die is tossed thrice. Find the probability of getting an odd number at least once ?

(a) 7/5
(b) 6/5
(c) 7/8 
(d) 2/8

ANSWER

EXPLANATION

4. The probability of obtaining an even prime number on each die, when a pair of dice is rolled is :

(a) 0
(b) 1/3
(c) 1/12
(d) 1/36

ANSWER

EXPLANATION

5. 6 coins are tossed simultaneously . The probability of getting atleast 6 heads is :

(a) 57/64
(b) 229/256
(c) 7/64
(d) 37/256

ANSWER

EXPLANATION

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