can someone check my answers on these probability questions

Question

fuzzybird · Answer

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fuzzybird · Answer

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benthicflare · Answer

Two numbers equating to 10 looks perfectly correct.

Lining up at the deli - you need to first calculate the probability of the first person going correctly in the line, then the probability of the second person going correctly, then the third person, so on and so forth. I will leave the final calculation up to you if you understand the thought process I'm delineating.

fuzzybird · Answer

I don't think I'm understanding this. I keep thinking it's six but I'm wrong.

benthicflare · Answer

Okay so the probability of the first person going correctly in line is the correct person (only Joe) out of all 4 people. The probability is 1/4.

The probability of the second person going correctly in line is the correct person (only Murray) out of the remaining few (3 people). The probability is 1/3.

And so on and so forth

Do you get the concept?

fuzzybird · Answer

So it's B then?

fuzzybird · Answer

I know it seems like I'm acting stupid but i'm just having like a major brain fart here