variation

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superrrom: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Mon Sep 01, 2008 6:27 am; Thanked: 2 times

by superrrom » Sun Sep 28, 2008 4:40 pm

Thanks

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Source: Beat The GMAT — Problem Solving | Sun Sep 28, 2008 4:40 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pmFollowed by: 11 members; Thanked: 331 times

by cramya » Sun Sep 28, 2008 5:09 pm

1,-3,2,5,-4,-6

Three

1 * -3 = 1st pair
-3 * 2 = 2nd pair
5 and -4 = 3rd pair

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superrrom: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Mon Sep 01, 2008 6:27 am; Thanked: 2 times

by superrrom » Sun Sep 28, 2008 5:23 pm

your explanation is too brief and confusing

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Morgoth: Master | Next Rank: 500 Posts; Posts: 316; Joined: Mon Sep 22, 2008 12:04 amFollowed by: 1 member; Thanked: 36 times

by Morgoth » Mon Sep 29, 2008 4:40 pm

superrrom wrote:your explanation is too brief and confusing

I'll give it a shot.

The question is referring to consecutive terms of the sequence 1,-3,2,5,-4,-6

Therefore, you cant arrange this sequence in ascending or descending order.

variation = product of consecutive positive and negative TERMs.

1 * -3 = -3

-3 * 2 = -6

-4 * 5 = -20

Thus, 3 is the answer.

Hope this helps.

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superrrom: Senior | Next Rank: 100 Posts; Posts: 39; Joined: Mon Sep 01, 2008 6:27 am; Thanked: 2 times

by superrrom » Tue Sep 30, 2008 2:06 pm

Morgoth wrote:
superrrom wrote:your explanation is too brief and confusing
I'll give it a shot.

The question is referring to consecutive terms of the sequence 1,-3,2,5,-4,-6

Therefore, you cant arrange this sequence in ascending or descending order.

variation = product of consecutive positive and negative TERMs.

1 * -3 = -3

-3 * 2 = -6

-4 * 5 = -20

Thus, 3 is the answer.

Hope this helps.

Hey thanks

why 1 and -3 are "consecutive positive and negative TERMs"? just because -3 goes right after 1 in this specific sequence?
thanks

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Morgoth: Master | Next Rank: 500 Posts; Posts: 316; Joined: Mon Sep 22, 2008 12:04 amFollowed by: 1 member; Thanked: 36 times

by Morgoth » Tue Sep 30, 2008 2:41 pm

superrrom wrote: Hey thanks

why 1 and -3 are "consecutive positive and negative TERMs"? just because -3 goes right after 1 in this specific sequence?
thanks

Absolutely!

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