Mathematics, 08.04.2020 18:24 Bloom247
I roll a fair die twice and obtain two numbers X1= result of the first roll and X2= result of the second roll. Given that I know X1+X2=7, what is the probability that X1=4 or X2=4?
Answers: 1
, then 
means 
; otherwise,if 
, then 
.
each, hence total probability 
.
of the time.
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