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Hae Suk flips a penny, a nickel, and a dime. How many ways can she get at least two heads?

 Apr 20, 2019
 #1
avatar+101838 
+2

We have  2^3  outcomes = 8 outcomes

 

There is 1 flip where there are no heads   and 3 flips where there is only one head

Every other outcome will have two or more heads

 

So    8 - 3 - 1  =   4 ways

 

cool cool cool

 Apr 20, 2019
edited by CPhill  Apr 20, 2019
 #2
avatar+128 
-2

In total, there are 2^3 outcomes, or 8 outcomes.

 

These are the outcomes:

 

HHH

HHT

HTH

THH

TTH

THT

HTT

TTT

 

The top four outcomes(in bold)have at least two heads and those are the four outcomes that is the answer to the problem.

 

~~Hypotenuisance

 Apr 21, 2019
 #3
avatar+101838 
+1

THX, Hypotenuisance.....!!!!!

 

 

cool cool  cool

CPhill  Apr 21, 2019
 #4
avatar+128 
-2

No problem, CPhill!!

 

~~Hypotenuisance

Hypotenuisance  Apr 21, 2019

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