GMATPrep

BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

This topic has expert replies

Post new topic Post Reply

Previous Topic Next Topic

madhavi: Senior | Next Rank: 100 Posts; Posts: 57; Joined: Tue Jun 26, 2007 11:33 pm; Thanked: 4 times

GMATPrep

by madhavi » Tue Nov 27, 2007 4:17 am

[url=https://www.postimage.org/image.php?v=aVvIpCi][img]https://www.postimage.org/aVvIpCi.jpg[/img][/url]

[url=https://www.postimage.org/image.php?v=aVvIC50][img]https://www.postimage.org/aVvIC50.jpg[/img][/url]

[url=https://www.postimage.org/image.php?v=Pq1KOxzi][img]https://www.postimage.org/Pq1KOxzi.jpg[/img][/url]

For the first one I feel d can maximum take a value 6. So the info would not help.

2. whether r is -ve or +ve as long as p=r one can conclude. Why is the second condition needed?
[/img]

Quote

Source: Beat The GMAT — Data Sufficiency | Tue Nov 27, 2007 4:17 am

madhavi: Senior | Next Rank: 100 Posts; Posts: 57; Joined: Tue Jun 26, 2007 11:33 pm; Thanked: 4 times

by madhavi » Tue Nov 27, 2007 4:25 am

The attachments are here... Could not embed the images

Attachments

Quote

camitava: Legendary Member; Posts: 645; Joined: Wed Sep 05, 2007 4:37 am; Location: India; Thanked: 34 times; Followed by:5 members

by camitava » Tue Nov 27, 2007 4:53 am

madhavi, ur first Qs -
500 is the multiple of 100 closet to x -> Can be x = 451 or 499
400 is the multiple of 100 closet to y -> Can be y = 351 or 399
So x + y = 451 + 399 = 850 = Closet to 900
or = 451 + 351 = 802 = closet to 800

So E is the best option to chose.
Ur second qs -
To me, its coming as A which I think u have also chosen. Don't getting why C is the OA(If it is ...)?

Ur third qs -
f = 30! - right?
Now by stmt - 1 10^d is a factor of f. But d can be 1, 2, 3 or so.
But in stmt - 2, it is saying that d > 6.
Here we can get the value of d and that is 7.
Now question is - how? Look, 30! = product of first 30 integers
For 10, 20 and 30 there will be 3 zeroes coming at the end. Now for every 5 at the unit digit, the product will be zeroes at the unit or ten digit. It will be like - 25 x 4, 15 x 2 and 6 x 5. In (25 x 4), we are getting 2 zeroes for the rest, only 1 zero at the end. So number of zeros that can come in 30! is (3 [For 10,20 and 30] + 2 [25 * 4] + 1 [15 * 2] + 1 [6 * 5] ) = 7.
So d = 7. Am i clear to explain?

Correct me If I am wrong

Regards,

Amitava

Quote

sujaysolanki: Master | Next Rank: 500 Posts; Posts: 214; Joined: Wed Nov 14, 2007 6:30 am; Thanked: 15 times

by sujaysolanki » Tue Nov 27, 2007 5:20 am

Nice explantions camitava

Lets chk the one lft out ...

From 1 p = r

Let say p = 2 ---- case 1

1/2 > 2/6 ..Yes

Let say p = -2 ---- case 2

-1/2 > -1/3 No

hence Insufficient

From 2 r > 0 so case 2 above is eliminated ..and also p =r so only case 1 holds

hence C

Hope this helps

Quote

camitava: Legendary Member; Posts: 645; Joined: Wed Sep 05, 2007 4:37 am; Location: India; Thanked: 34 times; Followed by:5 members