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15 Sep 2017, 08:01
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C
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Difficulty:
25%
(medium)
Question Stats:
69% (01:08) correct
31%
(01:11)
wrong
based on 153
sessions
History
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Time
Result
Not Attempted Yet
What is the value of integer n ?
(1) (n – 2)(n + 2) = 5
(2) n(n + 2) = 15
(1) (n – 2)(n + 2) = 5
(2) n(n + 2) = 15
15 Sep 2017, 08:11
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Find: n
Given : is an integer
(1) (n – 2)(n + 2) = 5
=> 5 = 1* 5 Or -1 * -5
=> (n – 2)(n + 2) = 1*5 => n=3
=> (n – 2)(n + 2) = -5 * -1 => n =-3
2 values of n => Insufficient
(2) n(n + 2) = 15
=> 15 = 1*15 or 3*5 or -5 * -3 => 1*15 will not make sense here so lets check for other 2 values.
For n to be integer
=> n(n+2) =3*5 => n=3
=> n(n+2) = -5 * -3 => n= -5
2 values of n => Insufficient
1+2
=> n=3
Answer:C
Given : is an integer
(1) (n – 2)(n + 2) = 5
=> 5 = 1* 5 Or -1 * -5
=> (n – 2)(n + 2) = 1*5 => n=3
=> (n – 2)(n + 2) = -5 * -1 => n =-3
2 values of n => Insufficient
(2) n(n + 2) = 15
=> 15 = 1*15 or 3*5 or -5 * -3 => 1*15 will not make sense here so lets check for other 2 values.
For n to be integer
=> n(n+2) =3*5 => n=3
=> n(n+2) = -5 * -3 => n= -5
2 values of n => Insufficient
1+2
=> n=3
Answer:C
15 Sep 2017, 08:15
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Bunuel
Stmt 1: n^2-4 = 5
n=+3 or -3 . Not definite . So insufficient.
Stmnt 2: n^2+2n-15=0;
n=+3 or n=-5 . Again not a feinite value for n; so insufficinet.
Combinin 1&2 n=+3; SO sufficient.
Ans:C
