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If the two-digit integers M and N are positive and have the

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Director
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If the two-digit integers M and N are positive and have the [#permalink] New post 31 Aug 2008, 09:53
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If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N ?
(A) 181
(B) 163
(C) 121
(D) 99
(E) 44
Director
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Re: PS with multiple valid ans!!! [#permalink] New post 31 Aug 2008, 10:11
A and B

I think there is a typo, B probally should be 143
CEO
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Re: PS with multiple valid ans!!! [#permalink] New post 31 Aug 2008, 18:19
rao_1857 wrote:
If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N ?
(A) 181
(B) 163
(C) 121
(D) 99
(E) 44


11a + b + 11b + a = 11a+11b
so any OA that is divided by 11 is not the OA.
163 and 181 are not divided by 11. so there are 2 OAs :shock:
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Re: PS with multiple valid ans!!! [#permalink] New post 01 Sep 2008, 19:52
x2suresh wrote:
gmatnub wrote:
A and B

I think there is a typo, B probally should be 143


Agree with you.


Yup, it's a typo, the answer choices are supposed to be:
A) 181
B) 165
C) 121
D) 99
E) 44

I have a total of 3 OG 11's. I got 1 as part of the bundle of books that is sent when you sign up for the MGMAT course. When i called to complain about all of the typos i found, i was advised that they can send the 'Official List' of typos. I refused and demanded a replacement - they sent one, but it was the same exact book. Called them a 3rd time and spoke to my rep there, she went through the questions that i knew had typos, and the book on her desk was not part of that particular 'print run' so she sent me that one.

Long story short - There is a print run of OG 11 that has several mistakes..

couple others....
Page 154 PS #20 Error in Drawing and answers
Page 335 DS #142 Explanation - (xr)^2 = x^r2 ... Should be (x^r)^2 = x^2r
Page 309 DS #68 Explanation - j+k+14/2 instead of /3
Page 228 PS #132 Explanation - 6($360+4x) instead of 6($360)+4x
Re: PS with multiple valid ans!!!   [#permalink] 01 Sep 2008, 19:52
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