variation

This topic has expert replies
Source: — Problem Solving |

Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

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

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

User avatar
Master | Next Rank: 500 Posts
Posts: 316
Joined: Mon Sep 22, 2008 12:04 am
Thanked: 36 times
Followed by:1 members

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.

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

User avatar
Master | Next Rank: 500 Posts
Posts: 316
Joined: Mon Sep 22, 2008 12:04 am
Thanked: 36 times
Followed by:1 members

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!