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10 Dec 2009, 13:00
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I got this answer right by guessing..
want to know the methodical approach.
want to know the methodical approach.
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10 Dec 2009, 13:18
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let me try..
question stem let c be number of chairs then c-1 is number of rows
and we know both c and c-1 are integers
S1 ) c * c-1 = 72 ==> only c= 9 satisfies this hence sufficient
S2) 2c-1 = 17 ==> c= 9 , sufficient
Ans. D
question stem let c be number of chairs then c-1 is number of rows
and we know both c and c-1 are integers
S1 ) c * c-1 = 72 ==> only c= 9 satisfies this hence sufficient
S2) 2c-1 = 17 ==> c= 9 , sufficient
Ans. D
10 Dec 2009, 13:25
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Let take C - chairs in each row
R - total no of rows
So \(R=C-1\)
Total # chairs = \(C(C-1)\)
Statement 1.
Total # of chairs = 72
\(C(C-1)=72\)
\(9*8=72\)
\(C=9, R=8\)
Statement sufficient
Statement 2.
\(2C-1=17\)
\(C=9\)
Statement sufficient
D
R - total no of rows
So \(R=C-1\)
Total # chairs = \(C(C-1)\)
Statement 1.
Total # of chairs = 72
\(C(C-1)=72\)
\(9*8=72\)
\(C=9, R=8\)
Statement sufficient
Statement 2.
\(2C-1=17\)
\(C=9\)
Statement sufficient
D
