Bunuel
Is 13N a positive number?
(1) -21N is a negative number
(2) N² < 1
Target question: Is 13N a positive number? Statement 1: -21N is a negative number We know that (NEGATIVE)(POSITIVE) = NEGATIVE
Since -21 is NEGATIVE, it must be the case that N is POSITIVE
If N is POSITIVE, then
13N is definitely a positive numberSince we can answer the
target question with certainty, statement 1 is SUFFICIENT
Statement 2: N² < 1 There are several values of N that satisfy statement 2. Here are two:
Case a: N = 1/2, in which case N² = (1/2)² = 1/4, which is less than 1. In this case
13N = (13)(1/2) = 6.5. So, 13N is POSITIVECase b: N = -1/2, in which case N² = (-1/2)² = 1/4, which is less than 1. In this case
13N = (13)(-1/2) = -6.5. So, 13N is NEGATIVESince we cannot answer the
target question with certainty, statement 2 is NOT SUFFICIENT
Answer:
Cheers,
Brent