GMAT Probability, Permutations, and Combinations Trick

Рет қаралды 64,717

Күн бұрын

Study for the GMAT with Magoosh! 🎓 bit.ly/3Fb4T33
In this video Magoosh's test prep expert, Erika, shares a useful trick for solving probability, permutation, and combination questions on the GMAT math section!
00:00 - Erika introduces the video
01:00 - What to solve for
01:54 - Probability Example
07:00 - Permutations and Combinations
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Пікірлер: 55

@ishikabansal9031 3 жыл бұрын

Erika is a great teacher! Kudos to Magoosh for getting her on board. 😀

@MagooshGMAT 3 жыл бұрын

We are lucky to have such great instructors!

@ivandobrev122 2 жыл бұрын

You are awesome! Thanks to the whole Magoosh team!

@soumyadeepdas1536 Ай бұрын

THANKS ERIKA YOU ARE AN AWESOME TEACHER!! ALL THE ADVICES AND ANECDOTES WHERE REALLY USEFUL!!

@kartikdixit8100 2 жыл бұрын

Thanks Erika... Was really helpful.. looking forward to some more videos.

@MagooshGMAT 2 жыл бұрын

Awesome, we're glad you liked it! Thanks for commenting :)

@derisazahara7696 3 жыл бұрын

Great video!

@gianleking 3 жыл бұрын

So useful omg

@jaskeeratsingh5491 2 жыл бұрын

Hi. Great video as always. The equilateral traingles can be found easily. Draw a circle. Mark 15 equidistant dots on it (as given in the question). To draw an equilateral triangle with 1st dot selected, select 5th and 10th dot. For equilateral triangle with 2nd dot, select 6th and 11th dot and so on which gives 5 equilateral triangles.

@MrIndman Жыл бұрын

1, 1+5, 1+10; 2, 2+5, 2+10;....

@mbaman7363 3 жыл бұрын

my favourite teacher

@MagooshGMAT 3 жыл бұрын

Woohoo! Thanks for sharing :)

@nehalvarma8576 3 жыл бұрын

Thank you so much to Erika and the Magoosh team

@MagooshGMAT 3 жыл бұрын

Our pleasure, thanks for stopping by! 😁

@sinjanmajumder3316 2 жыл бұрын

Wow ! This is a classic one. Loved it !

@MagooshGMAT 2 жыл бұрын

Glad you liked it! Thanks for the comment :)

@cameronlarson4046 Жыл бұрын

Thanks! This helped.

@learningbud1209 2 жыл бұрын

A very nice explanation. Thank you 🙏

@MagooshGMAT 2 жыл бұрын

Woohoo! Glad you liked it :) Thanks for stopping by!

@sudhansusingh2886 3 жыл бұрын

Thank you for the video. Gained good knowledge

@MagooshGMAT 3 жыл бұрын

Thanks for the comment, we're glad it was useful for you! :)

@ArathiNayak 3 жыл бұрын

How the last question was solved blew my mind!

@MagooshGMAT 3 жыл бұрын

Sometimes these tough problems aren't as tough as they seem!

@abheetnigam 3 жыл бұрын

Erikaaaa is backk!!!!

@AJ-et3vf 9 ай бұрын

Great video! Thank you!

@MagooshGMAT 9 ай бұрын

You are welcome!🙌

@yashchavan9403 2 жыл бұрын

Great Tips 👍

@andresjustinianod.7067 2 жыл бұрын

Thanks Erika!

@learningdesignstudios 3 жыл бұрын

Hi Erika/Magoosh, pardon me but I'm not able to find the blog article which explains the last problem (circle/triangles). Can you please share the link?

@MagooshGMAT 3 жыл бұрын

Hello there! Here's the one you're looking for :) magoosh.com/gmat/difficult-gmat-counting-problems/

@learningdesignstudios 3 жыл бұрын

@@MagooshGMAT Thank you team!

@juancarloscevallos3899 18 күн бұрын

After seeing all of your GREAT explanations (thx 4 that), I only have one question, and I'm afraid is kind of a dumb one (lol). Last problem, the one with the equilateral triangles... The 15 factorial (15!) was 15 x 14 x 13. My question is: Doesn't the factorial (!) mean 15 x 14 x 13 x 12 x 11 x 10 and so on til 1? I mean, how do you know that you needed to stop at 13? Thanks

@nileshmishra4602 Жыл бұрын

Awesome video

@MagooshGMAT Жыл бұрын

Thank you!🙌

@EEBAsrithaDevineni 2 жыл бұрын

hi erika! where can i find your teaching for gmat in magoosh.

@ashishsinha9035 Жыл бұрын

Great!

@MagooshGMAT Жыл бұрын

Thank you!

@collinsondiek9943 2 жыл бұрын

If you simplify 2/6 in the first question , it becomes 1/3 raised to power 4 it becomes 1/81 1-(1/81) = 80/81 which E. can you explain why you simplify in the 2nd question and not in the 1st question

@therandomthings9128 2 жыл бұрын

You solved wrong.

@vishalrao5107 5 ай бұрын

Hello, Erika Is a specialised tutoring plan available for GMAT currently I already have a strong base in quants and need to advance it and have medium verbal ability. Planning for gmat in 4 months !!

@MagooshGMAT 5 ай бұрын

Not at Magoosh right now, but there are services elsewhere. Good luck!

@vinayviking 3 жыл бұрын

What happened to Prepscholar GMAT?

@kartikization Жыл бұрын

I solved all 😅

@MagooshGMAT Жыл бұрын

Great job!

@malavthakor2202 2 жыл бұрын

For question no 2. Why could we not just choose (1/3)^8??

@therandomthings9128 2 жыл бұрын

Because they specifically asked for AT LEAST 1 blue marble.

@shanicesegolenemaatchideku770 11 ай бұрын

Sorry bit you got me lost at 11:19. I don't understand how you did the divisions of the factorial.

@MagooshGMAT 11 ай бұрын

You can review how to divide factorials here: gmatclub.com/blog/2012/01/gmat-permutations-factorial-trick/

@heemoyemeni2220 Жыл бұрын

You said the write answer is 80 why you change it to 77 how we can know that

@MagooshGMAT Жыл бұрын

Even though the total number of possible combinations is 80, there is a restriction in the question: "the paper, ribbon, and bow cannot all be the same color." So that reduces the number of combintions.