GMATPrep DS 8

[parisfr67]

See attached question -- Question from GMATPrep#1-DS#8
Could someone explain why together these are sufficient but each alone are sufficient to answer if the least height from A(r) is greater than the least height from B(s) with a yes or no?

This is a Yes/No question and for sufficiency all that is needed is a YES or NO answer to each (1) and (2)

1) No, Ar is not greater than Bs -- r is less than s as stated
2) No, Ar is not greater than Bs -- No info about r and s -- Not enough info from the greatest (g,h) to deduce that r is greater than s

The correct answer is be C, I chose E forgetting about the fact that for yes/no questions, sufficiency is acquired by a yes or no -- i defaulted to not sufficient and hence E -- now i am thinking D because of yes/no sufficiency rules and I am now confused.

I am clearly not thinking properly about this problem -- Kindly put me back on track -- much appreciated

[malnv]

let l1 be lowest value in A, l2 for B


(1).

r <s>h .. not suff.

combine 1,2 .

Given that g-h is +ve
i.e. l1 -l2 is +ve

l1 > l2

Ans: C

(update:having hard time with formatting..see attached jpg image)

[parisfr67]

Yes the range, did not use that to get to the answer

A in [r,g], range --> g-r
B in [s,h], range --> h-s

question is:
Ar >Bs
or
g-r > h-s
g+s > h+r

(1) r<s>r ... nothing about g and h ... NOT SUFF
(2) g>h ... nothing about r and s ... NOT SUFF

Together is sufficient for g>h and s>r
hence, g+s > h+r or Ar > Bs ...

Thank you for taking the time to JPG the answer
much appreciated
Alain

[gabriel]

let l1 be lowest value in A, l2 for B


(1).

r <s>h .. not suff.

combine 1,2 .

Given that g-h is +ve
i.e. l1 -l2 is +ve

l1 > l2

Ans: C

(update:having hard time with formatting..see attached jpg image)

Hi,

can u tell me what exactly was the problem you faced with formatting.

To all members : - In the future if you face any problem while posting just send a PM to me, or any other moderator (or Eric) on the board. It would be really helpful.

Thank you

[malnv]

Hi Gabriel,

I am not sure, but some character combination seems to trigger this..

I tried to copy paste the text (as in .jpg), but if you look, it doesn't come out correctly. Something with < , > signs, or () or a combination of them..

Thx.

[gabriel]

Hi Gabriel,

I am not sure, but some character combination seems to trigger this..

I tried to copy paste the text (as in .jpg), but if you look, it doesn't come out correctly. Something with < , > signs, or () or a combination of them..

Thx.

Have reported the matter to Eric, I am sure it will be fixed soon

Regards.

[camitava]

gabriel, this problem was faced in past as well. Actually in a problem or solution, whenever we use "Greater than" or "Less than" sign, this problem comes. This problem is basically for the HTML tags. If in such posts, we select - "Disable HTML in this post" - the check-box, then we can get rid of this problem.