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Q.

If two coins are tossed simultaneously, then find the probability of getting at least one head.


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a

1 4  

b

1 2  

c

3 4  

d

1 

answer is C.

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Detailed Solution

We need to find the probability of getting at least one head when two coins are tossed simultaneously.
There must be a total of four outcomes.
Sample space ={HH,HT,TH,TT}   So, we have three cases in which at least one head is there from the total four cases.
We can calculate the probability using the formula,
P(A)=  number of favorable outcomes   total number of outcomes   
Probability of getting at least one head = 3 4  .
Hence, option 3 is correct.
 
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