Is a positive?

Question

Is a positive?

(1) a - b > 0
(2) 2a - b > 0

vardhanindaram · Answer

a b
3 1
-1 -3
This shows a can be either +ve or -ve
Hence answer E

rohit8865 · Answer

Picking no. is best solution 
1. a-b>0

a=5: b=3.....yes
a=-1:b=-4....No.......insuff

2. 2a-b>0

a=5: b=1....Yes
a=-1/2 : b=-3....No........insuff

combining again
a=5: b=1....Yes
a=-1/2 : b=-3....No.......insuff

Ans E.

Mo2men · Answer

Is a positive?

(1) a - b > 0

a-b>0...a>b

Let a = 1 & b=-100..........Answer is Yes

Let a =-1 & b=-100..........Answer is No

Insufficient

(2) 2a - b > 0

2a-b>0...2a>b

Let a = 1 & b=-100..........Answer is Yes

Let a =-1 & b=-100..........Answer is No

Combining 1 & 2, using same examples, it is still insufficient

Answer: E

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