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+11
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Suppose we flip four coins simultaneously: a penny, a nickel, a dime, and a quarter. What is the probability that the penny and dime both come up the same?

 Jun 15, 2020
 #1
avatar+1130 
+5

so we have 16 orders and there are 2 orders that make the penny and dime both come up the same so the probability is 1/8

 

 

 

edited:reson oops I solved the wrong problem

 Jun 15, 2020
edited by jimkey17  Jun 15, 2020
 #3
avatar+986 
+1

I'm not sure if you were right or wrong...

 

The question has some ambiguity so It's best to leave both answers.

hugomimihu  Jun 15, 2020
 #4
avatar+1130 
+5

Yeah my other answer was 1/2

jimkey17  Jun 15, 2020
 #2
avatar+986 
+2

Does your question mean ONLY them come up the same or at LEAST?

 

SO.

 

I'll go with least.

 

There is a 1/2 chance dime gets same as penny.

 

If penny is heads, 1/2 dime head, etc.

 

If it's ONLY...

 

1/2 chance, and 1/2*1/2 chance that the other ones are NOT the same, so 1/8 of getting the same, if ONLY the penny and dime are the same.

 Jun 15, 2020
edited by hugomimihu  Jun 15, 2020
 #6
avatar+344 
+7

you are right(it is 1/2)

polyyou  Jun 15, 2020
 #5
avatar+344 
+9

it is 1/2smiley

 Jun 15, 2020
 #7
avatar+986 
+2

Ok! Great!

hugomimihu  Jun 15, 2020

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