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Coco flips 3 coins. Each coin is fair. What is the chance for at least one head to be up?

 Feb 10, 2022
edited by Peakpine1  Feb 10, 2022
 #1
avatar+726 
+1

We can use complementary counting, and see what are the odds of 0 heads to be up. Since there are 3 coins, and there is a 50% chance to get heads or tails, the odds of having 0 heads is (1/2)^3 = 1 in 8. 

 

Then, subtracting 1/8 from the total probability (8/8), we get the chance for at least one head to be up as 7/8.

 

prsmileyyacoolp

 Feb 10, 2022
 #2
avatar+36434 
+1

There are 8 possibilities

   only ONE  ( T T T ) has no 'HEADS'

so  7/ 8 have at leat ONE head

 Feb 10, 2022
 #3
avatar+18 
0
Thanks you so much!
 Feb 18, 2022

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