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Series - M3 - 29

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mrsmarthi
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 Q49  V29
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Series - M3 - 29 [#permalink] New post   13 Oct 2009, 21:18
A computer generated a consecutive set of numbers using the following formula:

An = A1 + ((n-1)*d) where d is the common difference between any two consecutive numbers of set .

If the sum of the second and the fifth number in the set is 8, and the sum of the third and the seventh number is 14, what is the first number in set ?

A) 3
B) 2
C) 1
D) -1
E) -3

I know how the problem can be solved. But I was confused with the word consecutive. Can we have the word consecutive when the numbers in the set are really not consecutive rather equidistant? :(

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Re: Series - M3 - 29 [#permalink] New post   13 Oct 2009, 22:04
mrsmarthi wrote:
A computer generated a consecutive set of numbers using the following formula:

An = A1 + ((n-1)*d) where d is the common difference between any two consecutive numbers of set .

If the sum of the second and the fifth number in the set is 8, and the sum of the third and the seventh number is 14, what is the first number in set ?

A) 3
B) 2
C) 1
D) -1
E) -3

I know how the problem can be solved. But I was confused with the word consecutive. Can we have the word consecutive when the numbers in the set are really not consecutive rather equidistant? :(


There are only 3 connsecutive integers:

1. Connsecutive integers: 1, 2, 3, 4, 5,........
2. Connsecutive even integers: 2, 4, 6........
3. Connsecutive odd integers: 1, 3, 5,........

1, 5, 9, 13, .......
0, 5, 10, 15, .......
10, 20, 30, 40, 50 .......

None of the above are consecutive integers..
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mrsmarthi
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 Q49  V29
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Re: Series - M3 - 29 [#permalink] New post   13 Oct 2009, 22:21
GMAT Tiger,

I do agree with you regarding the definition of consecutive integers, consecutive even and consecutive odd integers. But my question is - wil be below also be called consecutive?

3,6,9....

My impression is when the question says consecutive numbers, the difference between adjacent numbers must be +/- 1.

I think the question is misleading by specifying the word - consecutive while rather difference is 2.

Can anyone please comment on my understanding.
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Re: Series - M3 - 29 [#permalink] New post   13 Oct 2009, 22:33
mrsmarthi wrote:
GMAT Tiger,

I do agree with you regarding the definition of consecutive integers, consecutive even and consecutive odd integers. But my question is - wil be below also be called consecutive?

3,6,9....

My impression is when the question says consecutive numbers, the difference between adjacent numbers must be +/- 1.

I think the question is misleading by specifying the word - consecutive while rather difference is 2.

Can anyone please comment on my understanding.


Nope. As I said earlier, none of the followings are consecutive integers..


3,6,9....
1, 5, 9, 13, .......
0, 5, 10, 15, .......
10, 20, 30, 40, 50 .......

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Re: Series - M3 - 29 [#permalink]
13 Oct 2009, 22:33
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Bunuel
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