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Bunuel
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VibhuAnurag
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The order doesn't matter here as there is no sequence. The only thing that matters is that only Brian succeeds. Therefore, we can ignore the ordering.

Peterparker2
I had one doubt. There can be a case where Brian succeeds first, Or Brian succeeds second, or Brian succeeds third it can be MBA, MAB, AMB, BAM, and so on...
The equation will be this:

P(Matt failed) x P(Brian succeeded) x P(Andrew failed) x 3!
why is the equation wrong?

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How can I know the order doesn't matter? Feeling a bit confused about identifying these kind of questions
VibhuAnurag
The order doesn't matter here as there is no sequence. The only thing that matters is that only Brian succeeds. Therefore, we can ignore the ordering.


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Bunuel Can you help me out on the above?
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