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Mathematics 11 Online
OpenStudy (anonymous):

Please help fan+medal!! Find the probability of choosing the same activity when two friends each randomly choose 1 of 4 extracurricular activities to participate in. Enter your answer in simplified fraction form. ???

OpenStudy (anonymous):

Any clues?

OpenStudy (anonymous):

i guess my answer didn't help?

OpenStudy (anonymous):

no

OpenStudy (anonymous):

its 1/16

OpenStudy (anonymous):

right? 1/4 * 1/4= 1/16

OpenStudy (anonymous):

not the way i read the question no

OpenStudy (anonymous):

suppose there are four activities, lets call them A, B, C, D what you wrote is the probability that both pick A

OpenStudy (anonymous):

how?

OpenStudy (anonymous):

is that clear?

OpenStudy (anonymous):

ooh so is it 1/16*1/4?

OpenStudy (anonymous):

or times 4 instead?

OpenStudy (anonymous):

no not divided by 4, times 4

OpenStudy (anonymous):

so the answer is 1/4?

OpenStudy (anonymous):

they both pick A or they both pick B or they both pick C or they both pick D

OpenStudy (anonymous):

yes, but there is an easier way to see this than that method

OpenStudy (anonymous):

how can I figure it out faster?

OpenStudy (anonymous):

imagine that the pick one after the other the first person has to pick something the second person has 4 choices, one of which is the same as the first person's pick

OpenStudy (anonymous):

so theres a 1/4 chance the second person will pick the same which is why it makes it 1/4?

OpenStudy (anonymous):

yes

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