Probability Questions Answers

1. In a throw of coin what is the probability of getting head.
 1
 2
 1/2
 0
Answer And Explanation
Answer: Option C
Explanation:
Total cases = [H,T]  2
Favourable cases = [H] 1
So probability of getting head = 1/2 
2. In a throw of coin what is the probability of getting tails.
 1
 2
 1/2
 0
Answer And Explanation
Answer: Option C
Explanation:
Total cases = [H,T]  2
Favourable cases = [T] 1
So probability of getting tails = 1/2 
3. Two unbiased coins are tossed. What is probability of getting at most one tail ?
 \begin{aligned} \frac{1}{2} \end{aligned}
 \begin{aligned} \frac{1}{3} \end{aligned}
 \begin{aligned} \frac{3}{2} \end{aligned}
 \begin{aligned} \frac{3}{4} \end{aligned}
Answer And Explanation
Answer: Option D
Explanation:
Total 4 cases = [HH, TT, TH, HT]
Favourable cases = [HH, TH, HT]
Please note we need atmost one tail, not atleast one tail.
So probability = 3/4 
4. Three unbiased coins are tossed, what is the probability of getting at least 2 tails ?
 1/3
 1/6
 1/2
 1/8
Answer And Explanation
Answer: Option C
Explanation:
Total cases are = 2*2*2 = 8, which are as follows
[TTT, HHH, TTH, THT, HTT, THH, HTH, HHT]
Favoured cases are = [TTH, THT, HTT, TTT] = 4
So required probability = 4/8 = 1/2 
5. In a throw of dice what is the probability of getting number greater than 5
 1/2
 1/3
 1/5
 1/6
Answer And Explanation
Answer: Option D
Explanation:
Number greater than 5 is 6, so only 1 number
Total cases of dice = [1,2,3,4,5,6]
So probability = 1/6 
6. What is the probability of getting a sum 9 from two throws of dice.
 1/3
 1/9
 1/12
 2/9
Answer And Explanation
Answer: Option B
Explanation:
Total number of cases = 6*6 = 36
Favoured cases = [(3,6), (4,5), (6,3), (5,4)] = 4
So probability = 4/36 = 1/9 
7. Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even ?
 3/4
 1/4
 7/4
 1/2
Answer And Explanation
Answer: Option A
Explanation:
Total number of cases = 6*6 = 36
Favourable cases = [(1,2),(1,4),(1,6),(2,1),(2,2),(2,3),(2,4),(2,5),(2,6),(3,2),(3,4),(3,6),(4,1),(4,2),(4,3),(4,4),(4,5),(4,6),(5,2),(5,4),(5,6),(6,1),(6,2),(6,3),(6,4),(6,5),(6,6)] = 27
So Probability = 27/36 = 3/4

Aaradhy 2 years ago
Ty for this questions but if there should be more que then it would be more good????????????????

Taimoor khan 2 years ago
Excellent, fabulous ... but
Add more questions plz 
Preeta Shashi 2 years ago
there are 12 face cards and not 16 as given in solution of one of the question.

shalu 4 years ago
ques are gud.....bt add up more ques....

ranga 5 years ago
more questions please

Master Sridhar 5 years ago
Hello Boss, Post questions for IBPS SO

abhi 5 years ago
more questions plz