It is currently 26 Jun 2017, 16:13

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# complicated tables

Author Message
Manager
Joined: 18 Jun 2007
Posts: 87

### Show Tags

18 Aug 2007, 15:10
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

### Show Tags

18 Aug 2007, 15:27
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: 727

### Show Tags

19 Aug 2007, 22:44
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: 5043
Location: Singapore

### Show Tags

19 Aug 2007, 23:01
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: 727

### Show Tags

19 Aug 2007, 23:20
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.

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: 1262

### Show Tags

20 Aug 2007, 01:09
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

### Show Tags

20 Aug 2007, 07:38
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
20 Aug 2007, 07:38
Display posts from previous: Sort by