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four uncles and three aunts

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by sanju09 » Tue Oct 20, 2009 5:07 am
F and M are father and mother of S, respectively. S has four uncles and three aunts. F has two siblings. The siblings of F and M are unmarried. How many brothers does M have?

(1) F has two brothers.

(2) M has five siblings.



OA in next post.
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Re: four uncles and three aunts

by uttam.albela » Fri Oct 23, 2009 5:40 am
sanju09 wrote:F and M are father and mother of S, respectively. S has four uncles and three aunts. F has two siblings. The siblings of F and M are unmarried. How many brothers does M have?

(1) F has two brothers.

(2) M has five siblings.



OA in next post.
Consider option 1.

F has 2 siblings and both are male. So S has 2 uncles from his father side. So other 2 uncles must be from Mother side. So M has 2 brothers.
So option 1 is sufficient to solve it.

Consider option 2.

M has 5 siblings. this is just repeating the question. No new information. if father has 2 sibling and child has total 7 uncle+aunt. And none married so M has to have 5 siblings. We can not know how many bro and sis for M. Can not solve using this option.


So the answer is A.
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