Lesson: Even and Odd Integers

Comment on Even and Odd Integers

What the answer to the Greenlight Test Prep question? I get iii as an answer, but not i or ii, so I did something wrong...
greenlight-admin's picture

Question link: https://greprepclub.com/forum/m-and-n-are-positive-integers-if-mn-2m-n-1...

Oops I forgot to include the correct answer.

Thanks for the heads up! It's fixed now.

Cheers,
Brent

Hi Brent,
I solved the question as follows https://greprepclub.com/forum/if-m-19-is-an-even-integer-which-of-the-following-must-tru-1846.html

Property Even/Odd is an integer and even. This means that its final value is even. As for positive or negative , it may or may not be so we cant be sure.
greenlight-admin's picture

Question link: https://greprepclub.com/forum/if-m-19-is-an-even-integer-which-of-the-fo...

Looks good to me!!

Cheers,
Brent

https://greprepclub.com/forum/qotd-26-x-y-and-z-are-consecutive-even-integers-2746.html

Is there any specific ordering of x,y,z that we have to follow for this question? I think we can assume values for the variables in any order necessary for reaching a conclusion. Please correct me if I am wrong.
greenlight-admin's picture

Question link: https://greprepclub.com/forum/qotd-26-x-y-and-z-are-consecutive-even-int...

Good question. Since there's no text suggesting the ordering of the integers, x, y and z can be arranged in any order.

Cheers,
Brent

https://greprepclub.com/forum/if-x-y-and-z-are-consecutive-positive-integers-with-x-y-13966.html
For this question, I thought that if the sum is even that the numbers all have to be even. The rule that odd+-even=odd, so this rule dosent work for this problem.
greenlight-admin's picture

Question link: https://greprepclub.com/forum/if-x-y-and-z-are-consecutive-positive-inte...

The rules for addition and subtraction are as follows:
#1. ODD +/- ODD = EVEN
#2. ODD +/- EVEN = ODD
#3. EVEN +/- EVEN = EVEN

Notice that these rules apply to adding or subtracting TWO values (not three).

Also notice that ODD + ODD = EVEN, and EVEN + EVEN = EVEN
So, if we know the sum up two numbers is EVEN, those two numbers can both the odd, or they can both be even.

Does that help?

Add a comment

Have a question about this video?

Post your question in the Comment section below, and I’ll answer it as fast as humanly possible.

Change Playback Speed

You have the option of watching the videos at various speeds (25% faster, 50% faster, etc). To change the playback speed, click the settings icon on the right side of the video status bar.

Let me Know

Have a suggestion to make the course even better? Email me today!

Free “Question of the Day” emails!