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by daretodream » Fri Feb 19, 2010 3:29 am
If mn = 3(m+1) + n and m and n are integers, m could be any of the following values EXCEPT:

(A) 2
(B) 3
(C) 4
(D) 5
(E) 7
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by harsh.champ » Fri Feb 19, 2010 3:45 am
daretodream wrote:If mn = 3(m+1) + n and m and n are integers, m could be any of the following values EXCEPT:

(A) 2
(B) 3
(C) 4
(D) 5
(E) 7
My doubt is :-Are you multiplying m X n or is mn a 2 digit number(That would make it 10m + n)??
It takes time and effort to explain, so if my comment helped you please press Thanks button :)



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by thephoenix » Fri Feb 19, 2010 4:00 am
daretodream wrote:If mn = 3(m+1) + n and m and n are integers, m could be any of the following values EXCEPT:

(A) 2
(B) 3
(C) 4
(D) 5
(E) 7
solving the eqn will be
m(n-3)=3+n

now plug in value for m and check the value of it should be an integer
for all value of m given above except m=5 n is int
so ans is D
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