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

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Is ab < a? (1) a = 0 (2) b = 0 [#permalink]

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New post 08 Mar 2017, 22:55
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Question Stats:

71% (00:34) correct 29% (00:33) wrong based on 51 sessions

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Is \(ab < a\)?

(1) \(a = 0\)
(2) \(b = 0\)
[Reveal] Spoiler: OA

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Re: Is ab < a? (1) a = 0 (2) b = 0 [#permalink]

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New post 09 Mar 2017, 08:57
Is ab < a?

(1) a = 0. Then, ab = 0.
Hence, ab = a. Sufficient.

(2) b = 0.
Suppose, a = 5. Then ab = 0 < a.

Again, suppose a = -5.
Then ab = 0 > a.
Hence, Insufficient.

Answer A.
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Re: Is ab < a? (1) a = 0 (2) b = 0 [#permalink]

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New post 09 Mar 2017, 09:41
Is \(ab < a\)?

Rearrange:

\(ab-a< 0\)

\(a(b-1)< 0\)


(1) \(a = 0\)

If a= 0.......then it is always will be 0 <0......Answer is No

Sufficient

(2) \(b = 0\)

If b=0.....then but no info about a

Insufficient

Answer A
Re: Is ab < a? (1) a = 0 (2) b = 0   [#permalink] 09 Mar 2017, 09:41
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