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# Provided that 4*12=6 and 8*8=1. Find 5*6 A.1 B.2 C.3

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Provided that 4*12=6 and 8*8=1. Find 5*6 A.1 B.2 C.3  [#permalink]  21 Nov 2005, 02:48
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Provided that 4*12=6 and 8*8=1. Find 5*6

A.1
B.2
C.3
D.4
E.5

Please don't feel unreasonable right away. Take a close look
VP
Joined: 22 Aug 2005
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C. 3

a*b = c
c is the *signle digit sum* of product

4*6 = 24
2+4 = 6

8*8= 64
6+4=10
1+0=1

5*6=30
3+0 = 3
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Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

SVP
Joined: 24 Sep 2005
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good try but not the correct answer ..this problem uses some method which you're especially good at( I can tell from many of your posts)
SVP
Joined: 28 May 2005
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I am absolutely clueless..... lexi.. where did you get this
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hey ya......

VP
Joined: 22 Aug 2005
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laxieqv wrote:
good try but not the correct answer ..this problem uses some method which you're especially good at( I can tell from many of your posts)

as long as explanation satisfies all constraints and has no flaws, it has to be answer

unless question is ambiguous
_________________

Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

Manager
Joined: 20 Nov 2005
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SVP
Joined: 24 Sep 2005
Posts: 1893
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Kudos [?]: 139 [0], given: 0

try more~! I'll post OE and OA after my class today ^_~ ...btw, don't forget about the reasonable/ conventional products..
Director
Joined: 21 Aug 2005
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Is it A) 1 ?

Ofcourse, i don't want to myself explaining how I came to this. This one should go in 'Fun Math' though apparently no one saw any fun in this...esp. stretchad!
SVP
Joined: 24 Sep 2005
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hik, this problem may be for fun maths or IQ test ..I'm sorry if it takes your precious time

OA is 2.
To find the answer, one needs to compare these weird products with their reasonable versions.
4*12= 48= 6 mod 7
4*12= 6 comes from the above reasoning

8*8= 64 = 1 mod 7
8*8=1 comes from the above reasoning

5*6= 30= 2 mod 7
---> 5*6= 2
Director
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See...that's why I didn't want to explain
My strategy for testing duttsit (and now including you) - I have posted in the GMAT forum under Titleist's post
VP
Joined: 22 Aug 2005
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Kudos [?]: 43 [0], given: 0

gsr wrote:
See...that's why I didn't want to explain
My strategy for testing duttsit (and now including you) - I have posted in the GMAT forum under Titleist's post

qsr, let me talk to titleist to create those sadistic work problems for you when you are about to attend exec meeting tomorrow

by the way, good that i didnt try..don't think would have gone close to OA

good question laxieqv ...
_________________

Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

SVP
Joined: 24 Sep 2005
Posts: 1893
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Kudos [?]: 139 [0], given: 0

gsr wrote:
See...that's why I didn't want to explain
My strategy for testing duttsit (and now including you) - I have posted in the GMAT forum under Titleist's post

3458^2389 = 30565492056345340534548605754645994343423355454353463423439964644545460753456343553472
Director
Joined: 21 Aug 2005
Posts: 793
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Kudos [?]: 9 [0], given: 0

laxieqv wrote:
gsr wrote:
See...that's why I didn't want to explain
My strategy for testing duttsit (and now including you) - I have posted in the GMAT forum under Titleist's post

3458^2389 = 30565492056345340534548605754645994343423355454353463423439964644545460753456343553474

Do you have a supercomputer or something at the University?
You both are Math 'Bombs'! Poor my fellow GMATTakers, because of guys like you, the 'harder' questions in the Q section will move to the 'easy Q's' bin. Very unfair Glad that I took the exam before you too!
Manager
Joined: 20 Nov 2005
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My husband got the answer this morning. Thanks for posting the answer!
SVP
Joined: 03 Jan 2005
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duttsit wrote:

as long as explanation satisfies all constraints and has no flaws, it has to be answer

unless question is ambiguous

Explanation has flaws.

duttsit wrote:
a*b = c
c is the *signle digit sum* of product

4*6 = 24
2+4 = 6

It was 4*12, not 4*6.
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Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.

Current Student
Joined: 29 Jan 2005
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laxieqv wrote:
gsr wrote:
See...that's why I didn't want to explain
My strategy for testing duttsit (and now including you) - I have posted in the GMAT forum under Titleist's post

3458^2389 = 30565492056345340534548605754645994343423355454353463423439964644545460753456343553472

SVP
Joined: 24 Sep 2005
Posts: 1893
Followers: 11

Kudos [?]: 139 [0], given: 0

GMATT73 wrote:
laxieqv wrote:
gsr wrote:
See...that's why I didn't want to explain
My strategy for testing duttsit (and now including you) - I have posted in the GMAT forum under Titleist's post

3458^2389 = 30565492056345340534548605754645994343423355454353463423439964644545460753456343553472

well, it's a top secret and my monopoly solution ( have to keep to defeat a supercomputer)
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