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# complicated tables

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Manager
Joined: 18 Jun 2007
Posts: 88
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complicated tables [#permalink]  18 Aug 2007, 14:10
Is there a simple strategy to solve questions that ask you to find total of a table with 7 rows and 7 columns

I cant draw a table here..

The table is like this
1 2 3 4 5 6 7
-2 -4 -6-8 -10- -12 -14.
.
.
.
.
.
7 14 ...................49
Manager
Joined: 15 Aug 2007
Posts: 70
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[#permalink]  18 Aug 2007, 14:27
There are some shortcut methods but they depend on the table...

Its not clear with the given table that what would be the 3rd line...

Director
Joined: 14 Aug 2007
Posts: 734
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Re: complicated tables [#permalink]  19 Aug 2007, 21:44
Sumithra Sen wrote:
Is there a simple strategy to solve questions that ask you to find total of a table with 7 rows and 7 columns

I cant draw a table here..

The table is like this
1 2 3 4 5 6 7
-2 -4 -6-8 -10- -12 -14.
.
.
.
.
.
7 14 ...................49

I am not sure but i think the series in each row looks like arithmatic progression we can use

sum = n( a1 + an) /2 for individual row and add it.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5068
Location: Singapore
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[#permalink]  19 Aug 2007, 22:01
this is from OG. I believe there is a certain pattern for each row. From there it would be easier to work out the sum.
Director
Joined: 14 Aug 2007
Posts: 734
Followers: 8

Kudos [?]: 123 [0], given: 0

Re: complicated tables [#permalink]  19 Aug 2007, 22:20
alpha_plus_gamma wrote:
Sumithra Sen wrote:
Is there a simple strategy to solve questions that ask you to find total of a table with 7 rows and 7 columns

I cant draw a table here..

The table is like this
1 2 3 4 5 6 7
-2 -4 -6-8 -10- -12 -14.
.
.
.
.
.
7 14 ...................49

I am not sure but i think the series in each row looks like arithmetic progression we can use

sum = n( a1 + an) /2 for individual row and add it.

I forgot to add that
for some rows we may need to apply the following formula

sum = n [ 2*a1 + (n-1) d]/ 2

n= num of terms
d = common differnce between 2 consecutive tems
GMAT Instructor
Joined: 04 Jul 2006
Posts: 1266
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Kudos [?]: 167 [0], given: 0

Re: complicated tables [#permalink]  20 Aug 2007, 00:09
Sumithra Sen wrote:
Is there a simple strategy to solve questions that ask you to find total of a table with 7 rows and 7 columns

I cant draw a table here..

The table is like this
1 2 3 4 5 6 7
-2 -4 -6-8 -10- -12 -14.
.
.
.
.
.
7 14 ...................49

If the sum of the first row is S, what are then sums of the other rows in terms of S?
Manager
Joined: 21 May 2007
Posts: 120
Followers: 1

Kudos [?]: 11 [0], given: 0

[#permalink]  20 Aug 2007, 06:38
Note that each row is AP (at least the ones mentioned are). Hence the average of each row is the middle column (4th Column). The sum of each row = 7x(middle column)

Hence, sum of table = 7x(sum of all terms in middle column)

Hope this works in the given problem. OP, can you please provide OA?

best,
parsifal
[#permalink] 20 Aug 2007, 06:38
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# complicated tables

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