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- Video Course
- Video Course Overview
- General GMAT Strategies - 7 videos (free)
- Data Sufficiency - 16 videos (free)
- Arithmetic - 38 videos
- Powers and Roots - 36 videos
- Algebra and Equation Solving - 73 videos
- Word Problems - 48 videos
- Geometry - 42 videos
- Integer Properties - 38 videos
- Statistics - 20 videos
- Counting - 27 videos
- Probability - 23 videos
- Analytical Writing Assessment - 5 videos (free)
- Reading Comprehension - 10 videos (free)
- Critical Reasoning - 38 videos
- Sentence Correction - 70 videos
- Integrated Reasoning - 17 videos

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## Comment on

Ages of Ann, Bea and Cho## Couldn't you put 9 and 1 as

## If we made 9 and 1 the other

If we made 9 and 1 the other two values in the third example (for statement 2), then the three numbers would be {1, 9, 10}, in which case the average would NOT equal 10 (one of the given conditions).

## I see the way you did it.

## Yes, that's an easy trap to

Yes, that's an easy trap to fall into :-)

Cheers,

Brent

## I wish this test wasn't all

## Ha! Yes, it certainly seems

Ha! Yes, it certainly seems that way at times!!

## Cheeky. So very cheeky. Fell

## It's an enticing answer

It's an enticing answer choice!!

## Hi brent,

I have learned that in arithmetic sequence the mean is always equal to median if its in odd number of sequence please correct me if i am wrong

## You're partially correct.

You're partially correct.

For ALL sequences in which the values are EQUALLY SPACED, the mean = the median.

It doesn't matter whether we have an odd or even number of values.

For example, in the set {3, 8, 13, 18}, the mean = the median = 10.5

This is covered in the following video: https://www.gmatprepnow.com/module/gmat-statistics/video/804

By the way, the GMAT doesn't expect students to know the term "arithmetic sequence."

Cheers,

Brent

## Add a comment