Is ab

Question

Is  ab < a ?

(1)  a = 0 
(2)  b = 0

chetan2u · Answer

Is  ab < a ?

(1)  a = 0 
If a is 0, ab=0, so ab<a becomes 0<0.
Answer is NO irrespective of the value of b. 
Sufficient

(2)  b = 0 
So ab<a becomes: Is 0<a?
We do not know the value of a. 
If a>0, yes others no. 
Insufficient

A

DHRJ0032 · Answer

1)a=0 
is 0<0 ? 
NO
SUFFICIENT.

2)a=5,b=0

is 0<5 ?
YES
a=-2, b=0
is 0<-2
NO
INSUFFICIENT.

A is the answer

LeoN88 · Answer

Statement# 1.

for a=0, we are getting 0<0, answer is no. Definitive sufficient answer.

Statement# 2.

for b=0, a might be -ve or +ve value.

0< -ve? yes, however 0<+ve ? no. Insufficinet.

Only A.

Showmeyaa · Answer

Asked: ab < a?
a(b-1)< 0?

1)a = 0
Is 0 < 0?
No - Sufficient!
2)b = 0
-a < 0?
Case1:
a = 1, -1 < 0, Yes!
Case2:
a = -1, 1 < 0, No! - Insufficient!
IMO, (A)!

adhya9 · Answer

IMO A

To check:
ab < a
ab - a < 0
a(b-1)<0

To check a<0 or b<1, Also you can compare with 'a' only if we know value of 'a'
So, a<0

Is ab < a? (1) a = 0 (2) b = 0