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Probability 1-1

1A number is selected at random from the first 50 positive integers. What is the probability that it is a Prime number?
A3/20
B5/20
C4/20
D7/20


2Four Fair coins are tossed together. Find the probability that tail appears on exactly one of the coins.
A2/4
B3/4
C1/4
D2/5


3 Four Fair coins are tossed together. Find the probability that tail appears on exactly two of the coins.
A7/8
B3/4
C5/8
D3/8


4Eight unbiased coins are tossed simultaneously. What is the probability that at least 2 tails turn up?
A233/256
B240/256
C222/256
D247/256


5An unbiased dice is rolled. What is the probability that the number appearing on the dice is even?
A1/3
B1/6
C1/2
D1/4


6When a fair cubical dice is rolled. What is the probability of getting a Prime number?
A1/3
B1/4
C1/2
D2/3


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