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G is a sequence

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by sanju09 » Sat Jul 31, 2010 4:21 am
G is a sequence such that each term is 3 more than the preceding term. What is the third term of G?

1. The middle term of G is 15.
2. The first term of G is 0.

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by nithi_mystics » Sat Jul 31, 2010 4:48 am
B is the answer

(1) we cannot say what the first term or the 3rd term is - INSUFF

(2) since 0 is the 1st term, 6 is the 3 rd term - SUFF
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by sanju09 » Sat Jul 31, 2010 4:58 am
nithi_mystics wrote:B is the answer

(1) we cannot say what the first term or the 3rd term is - INSUFF

(2) since 0 is the 1st term, 6 is the 3 rd term - SUFF
that's cool nithi_mystics, but I am looking for the best reason that could challenge the competency of (1)
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by nithi_mystics » Sat Jul 31, 2010 5:05 am
15 is the middle term.

For eg : the sequence can be

12,15,18 or 9,12,15,18,21

In the first case, 3rd term is 18 and in the 2nd case, 3rd term is 15.
==> We cannot determine the 3rd term from the middle term.

sanju09 wrote:
nithi_mystics wrote:B is the answer

(1) we cannot say what the first term or the 3rd term is - INSUFF

(2) since 0 is the 1st term, 6 is the 3 rd term - SUFF
that's cool nithi_mystics, but I am looking for the best reason that could challenge the competency of (1)
Thanks
Nithi
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by sanju09 » Sat Jul 31, 2010 5:34 am
nithi_mystics wrote:15 is the middle term.

For eg : the sequence can be

12,15,18 or 9,12,15,18,21

In the first case, 3rd term is 18 and in the 2nd case, 3rd term is 15.
==> We cannot determine the 3rd term from the middle term.

sanju09 wrote:
nithi_mystics wrote:B is the answer

(1) we cannot say what the first term or the 3rd term is - INSUFF

(2) since 0 is the 1st term, 6 is the 3 rd term - SUFF
that's cool nithi_mystics, but I am looking for the best reason that could challenge the competency of (1)
For (1), why can't we simply say that the length of the sequence G is not known.


What if we change the question a little?

G is a sequence such that each term is 3 more than the preceding term. How many terms does the sequence G contain?

1. The middle term of G is 15.
2. The first term of G is 0.
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by reply2spg » Thu Aug 05, 2010 11:28 am
This is not little change in question. This is a huge change in question

and for this question answer will be C
sanju09 wrote:
What if we change the question a little?

G is a sequence such that each term is 3 more than the preceding term. How many terms does the sequence G contain?

1. The middle term of G is 15.
2. The first term of G is 0.
Sudhanshu
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