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Shortcut for Odd and Even number type questions [#permalink]

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21 Apr 2013, 11:02

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This post received KUDOS

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I have formulated a technique to solve type of 'Odd and Even number type questions' quickly, thus saving ample amount of time for other questions. Basic concept used is of binary number calculations.

This equation can be solved mentally within 15secs. This technique has helped me in solving these types of question within 30 seconds with practice and hence saving a lot of time.

Last edited by rohitkg on 17 May 2013, 22:54, edited 1 time in total.

As someone with a degree in Computer Science who owns several binary clocks (seriously I own more than one... it's a little weird!), I will say: Kudos. As pointed out above, you have slight typos in e) and f) regarding which term is even and which term is odd. I'd also be remiss if I didn't mention that this works just as well using the numbers 1 and 0 in non-binary applications. 0x1 is still 1, 0+0 is still 0. The only difference is 1+1 = 2, which is even. In actuality, you can just use odd or even number to prove the rule without ever having to reference binary.

Nonetheless, I find it useful and insightful to think about in terms of number properties. And if it works well for you and others, then good job taking something abstract and making it familiar with terms you already know well. Good job!

Re: Shortcut for Odd and Even number type questions [#permalink]

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15 Mar 2014, 21:07

nicoki wrote:

thanks for this useful shortcut!!!

substraction is just llike addition

But, do you think it could be used for division somehow??

Hi Nicoki,

There is no rule as such for division of 'odd or even numbers' . Cause result can be fraction too in such cases. Don't worry no one will ask you question based on Division. Atleast I have never come across any such question.

Re: Shortcut for Odd and Even number type questions [#permalink]

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18 Aug 2015, 01:37

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Re: Shortcut for Odd and Even number type questions [#permalink]

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18 Aug 2016, 07:41

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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