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Re: If the quotient a/b positive, which of the following must be [#permalink]
05 Sep 2012, 06:14

1

This post received KUDOS

I think the best approach in such questions is to plug in numbers Since the question asks about must be true then any numbers should qualify, if a/b is positive then a and b have the same sign so a*b must be positive. (C) _________________

If you found my post useful and/or interesting - you are welcome to give kudos!

Re: If the quotient a/b positive, which of the following must be [#permalink]
05 Sep 2012, 18:55

4

This post received KUDOS

a/b implies a and b have the same sign.

a<0 AND b<0

or

a>0 AND b>0

A. a>0 does not have to be true, a can be negative B. b>0 does not have to be true, b can be negative C. ab>0, has to be true since a AND b have the same sign D. a-b>0 does not have to be true since a AND b can be negative and the result of a-b can be negative E. a+b>0 does not have to be true since a AND b can be negative and the result of a+b can be negative

Re: If the quotient a/b positive, which of the following must be [#permalink]
14 Jun 2013, 18:23

Hi Bunuel, what if a=0;b=2. we have a/b as positive as a result ab = 0. C fails.(:D is this some kind of miss in the question or Am i missing my basics here)

Tx

Bunuel wrote:

SOLUTION

If the quotient a/b positive, which of the following must be true?

(A) a > 0 (B) b > 0 (C) ab > 0 (D) a-b > 0 (E) a+b > 0

\frac{a}{b}>0 means a and b have the same sign, either both are negative or both are positive. Thus, their product will also be positive: ab>0.

Answer: C.

Kudos points given to everyone with correct solution. Let me know if I missed someone.

Re: If the quotient a/b positive, which of the following must be [#permalink]
14 Jun 2013, 23:56

Expert's post

p111 wrote:

Hi Bunuel, what if a=0;b=2. we have a/b as positive as a result ab = 0. C fails.(:D is this some kind of miss in the question or Am i missing my basics here)

Tx

Bunuel wrote:

SOLUTION

If the quotient a/b positive, which of the following must be true?

(A) a > 0 (B) b > 0 (C) ab > 0 (D) a-b > 0 (E) a+b > 0

\frac{a}{b}>0 means a and b have the same sign, either both are negative or both are positive. Thus, their product will also be positive: ab>0.

Answer: C.

Kudos points given to everyone with correct solution. Let me know if I missed someone.

If a=0 and b=2, then a/b=0. 0 is neither positive nor negative.

Re: If the quotient a/b positive, which of the following must be [#permalink]
29 Jun 2014, 05:28

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