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# How to know when to use Binomial Equation?

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Intern
Joined: 25 Jul 2017
Posts: 14
How to know when to use Binomial Equation?  [#permalink]

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22 Aug 2017, 17:46
What clues does the question give that you need to, or should, use the binomial equation?
Manager
Joined: 18 Dec 2016
Posts: 113
Re: How to know when to use Binomial Equation?  [#permalink]

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25 Aug 2017, 22:10
As far as I know, it is not essential to use binomial theorem. So, if you are struggling with the application of binomial theorem, remember that the question can be done without it.

A binomial theorem is like trigonometry for GMAT, if you know it, you may be able to solve some question directly, but even if you don't know it, you'll still be able to solve the questions.
Intern
Joined: 07 Jul 2017
Posts: 13
Concentration: Finance, Economics
GMAT 1: 610 Q42 V32
GMAT 2: 690 Q47 V37
Re: How to know when to use Binomial Equation?  [#permalink]

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26 Aug 2017, 01:14
Binomial Theorem:

P = nCr * (p^r) * ((1-p)^n-r)

--> let (p^r) be the prob for successes
--> let (1-p)^n-r be the prob for failures
--> let nCr be the number of ways that "successes" can be distributed among n trials (a combination)

For example you roll 6 dice all at the same time. Say you want to find the probability of rolling two 3's.
remember that the six dice are different

P = 6C2*((1/6)^2)*((5/6)^4)
Senior Manager
Joined: 02 Mar 2017
Posts: 259
Location: India
Concentration: Finance, Marketing
Re: How to know when to use Binomial Equation?  [#permalink]

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26 Aug 2017, 02:14
gmat_george wrote:
What clues does the question give that you need to, or should, use the binomial equation?

I agree with gmat2k17...Questions in gmat can be done without using it... If your getting confused,better avoid Equation
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Re: How to know when to use Binomial Equation?   [#permalink] 26 Aug 2017, 02:14
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# How to know when to use Binomial Equation?

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