Can you help? - question from OG10th - The Beat The GMAT Forum - Expert GMAT Help & MBA Admissions Advice

Can you help? - question from OG10th

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magical cook: Master | Next Rank: 500 Posts; Posts: 484; Joined: Sun Jul 30, 2006 7:01 pmFollowed by: 1 member; Thanked: 2 times

by magical cook » Fri Feb 02, 2007 9:19 pm

The attached question's answer is E. Can anyone solve and explain?? (I am not good at math...)

Thank you for your help!
R.

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Source: Beat The GMAT — Problem Solving | Fri Feb 02, 2007 9:19 pm

Neo2000: Legendary Member; Posts: 519; Joined: Sat Jan 27, 2007 7:56 am; Location: India; Thanked: 31 times

by Neo2000 » Sun Feb 04, 2007 1:53 am

Put 4 in the Thousand's place

Then the remaining 3 numbers can be arranged in 3! ways = 6
So there are 6numbers of 4xxxx which means a min value of 24,000

Similarly for 3 6x3 = 18000
For 2 = 12,000
For 1 = 6000

So a minimum value of 24+18+12+6 = 60,000

Remember that you still havent added the other numbers i.e. in the 4000 series you didnt add the value of 321 + 123+132+...

So your final answer has to be E 66,660

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magical cook: Master | Next Rank: 500 Posts; Posts: 484; Joined: Sun Jul 30, 2006 7:01 pmFollowed by: 1 member; Thanked: 2 times

Thanks!

by magical cook » Sun Feb 04, 2007 2:22 am

Thanks Neo for explaining it so clearly!

I now fully understand

Thanks again.
Rina

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Neo2000: Legendary Member; Posts: 519; Joined: Sat Jan 27, 2007 7:56 am; Location: India; Thanked: 31 times

Re: Thanks!

by Neo2000 » Sun Feb 04, 2007 2:30 am

magical cook wrote:Thanks Neo for explaining it so clearly!

Rina

Aww shucks 'twas nothing

Anytime

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kandelaki: Senior | Next Rank: 100 Posts; Posts: 37; Joined: Mon Feb 05, 2007 12:35 am

by kandelaki » Fri Feb 23, 2007 1:16 am

guys,

i found another way of solving it...

tell me if it is wrong, please

so
each combitation has 6 ways of starting with 1, 2, 3, 4
if we multiply and then add just thousands- 6*2, 6*1, 6*3, 6*4, we get in sum 60,

the D answer is 60000 but we know that it will be more than 60000 cause we just added the thousands and left hundreds tens etc
so it has to be E.

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Stacey Koprince: GMAT Instructor; Posts: 2228; Joined: Wed Dec 27, 2006 3:28 pmFollowed by: 694 members; Location: Montreal, Canada; Thanked: 639 times; GMAT Score:780

by Stacey Koprince » Mon Feb 26, 2007 11:04 pm

kandelaki - that's the most efficient way to do it - nice job!

Please note: I do not use the Private Messaging system! I will not see any PMs that you send to me!!

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