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# Probability vs combinations approach

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Senior Manager
Joined: 08 Dec 2015
Posts: 285
GMAT 1: 600 Q44 V27
Probability vs combinations approach  [#permalink]

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16 Feb 2017, 08:41
1
Hi everyone!

Is there a good pattern to look for when doing probability questions, so we can decide if take the probability approach or the combinations approach?

Also, is there a checklist of thing we have to look for before we approach the question?

Like it seems that when I do probabilities I have no method what so ever, I just select an approach that seems to make sense and do it because I have something I can solve in front of me.

Thank you!
GMAT Club Legend
Joined: 12 Sep 2015
Posts: 4018
Location: Canada
Re: Probability vs combinations approach  [#permalink]

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16 Feb 2017, 09:56
Top Contributor
1
iliavko wrote:
Hi everyone!

Is there a good pattern to look for when doing probability questions, so we can decide if take the probability approach or the combinations approach?

Also, is there a checklist of thing we have to look for before we approach the question?

Like it seems that when I do probabilities I have no method what so ever, I just select an approach that seems to make sense and do it because I have something I can solve in front of me.

Thank you!

Great question.
The answer isn't straightforward. In most cases, I find that applying the probability rules is the faster approach, but there are times when counting is better.
If you're interested, here's a video that's devoted to determining the best approach with probability questions.

Cheers,
Brent
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Re: Probability vs combinations approach  [#permalink]

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11 Oct 2018, 13:27
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Re: Probability vs combinations approach   [#permalink] 11 Oct 2018, 13:27
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# Probability vs combinations approach

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