when tossing 4 coins simultaneously , find the probability that at least 1 head is showing .

Question

when tossing 4 coins simultaneously , find the probability that at least  1 head is showing .

mathmate · Answer

Are you familiar with probability trees?

anonymous · Answer

no not really ! @mathmate

mathmate · Answer

Do you have any suggestions how to solve the problem?

nurali · Answer

The probability of getting tails for a given coin toss is (1/2). So for four coin tosses it is (1/2)^4. Thus: 
P(all 4 tails) = (1/2)*(1/2)*(1/2)*(1/2) = (1/2)^4 = 1/16 

Hence: 
P(atleast one head) = 1 - P(all tails) = 1 - 1/16 = 15/16

mathmate · Answer

@anna113 
@nurali has solved it exactly how I would have solved the problem, athough I may not have explained it the same way.
I suggest you follow up with nurali if you need further explanations.

anonymous · Answer

thanks @mathmate and @Nurali

nurali · Answer

Anytime.

mathmate · Answer

You're welcome!   Don't forget to give a medal to nurali!  :)