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

Redeem

PS relating to LCM

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 132
Joined: Fri Sep 05, 2008 10:19 pm
Location: Bangladesh
Thanked: 1 times

PS relating to LCM

by rabab » Wed Oct 01, 2008 8:18 am
If m is the least common multiple of 90, 196 and 300. which of the following is not a factor of m?

1. 600
2. 700
3. 900
4. 2100
5. 4900
Top
Source: — Problem Solving |
User avatar
Master | Next Rank: 500 Posts
Posts: 316
Joined: Mon Sep 22, 2008 12:04 am
Thanked: 36 times
Followed by:1 members

Re: PS relating to LCM

by Morgoth » Wed Oct 01, 2008 10:22 am
rabab wrote:If m is the least common multiple of 90, 196 and 300. which of the following is not a factor of m?

1. 600
2. 700
3. 900
4. 2100
5. 4900

IMO 600


90 = 2*3*3*5
196 = 2*2*7*7
300 = 2*2*5*5*3

LCM = M = 2*2*3*3*5*5*7*7


600 = 2*2*5*5*2*3 [this option has an extra 2 more than the LCM]

700 = 7*2*5*2*5

900 = 2*2*5*5*3*3

2100 = 2*2*5*5*3*7

4900 = 2*2*5*5*7*7


Thus, 600.

OA?
Top
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Wed Oct 01, 2008 7:28 pm
LCM = 44100

44100/600 WILL NOT BE A INTEGER
Top
Legendary Member
Posts: 833
Joined: Mon Aug 04, 2008 1:56 am
Thanked: 13 times

by vivek.kapoor83 » Wed Oct 01, 2008 7:46 pm
Sama IMO A. OA pls
Top
Master | Next Rank: 500 Posts
Posts: 458
Joined: Sun Aug 31, 2008 10:44 am
Thanked: 3 times
Followed by:1 members

by gmat009 » Wed Oct 01, 2008 10:19 pm
CAn someone help me plz.
I am trying to do LCM of 90,300,196
I am getting- 2*2*2*5*5*3*3*7*7 =88200
Somehow I am getting extra 2 and I don't know where I am doing wrong.
Top
Senior | Next Rank: 100 Posts
Posts: 93
Joined: Sun Jan 27, 2008 1:35 am
Thanked: 2 times

Re: PS relating to LCM

by HarvardDreamin » Wed Oct 01, 2008 10:54 pm
Morgoth wrote:
rabab wrote:If m is the least common multiple of 90, 196 and 300. which of the following is not a factor of m?

1. 600
2. 700
3. 900
4. 2100
5. 4900

IMO 600


90 = 2*3*3*5
196 = 2*2*7*7
300 = 2*2*5*5*3

LCM = M = 2*2*3*3*5*5*7*7


600 = 2*2*5*5*2*3 [this option has an extra 2 more than the LCM]

700 = 7*2*5*2*5

900 = 2*2*5*5*3*3

2100 = 2*2*5*5*3*7

4900 = 2*2*5*5*7*7


Thus, 600.

OA?
Agree with answer..
ON MY WAY TO HBS......
Top
Post new topic Post Reply
• Page 1 of 1