yangsta8 wrote:

Not quite satisfied with the OE for Statement 2. From picking numbers you can sort of figure it out but is there another method?

Question Stem : Is \frac{(\frac{a}{b})}{c} an integer?

Condition given is a, b and c are positive distinct integers.

I will just give the reasoning for St. (2) since that is what you have a problem with.

St. (2) : a = b + c

Substituting this in the question stem we get : Is

\frac{b+c}{bc} an integer?

It can be further reduced to : Is

\frac{1}{c} + \frac{1}{b} an integer?

Now we can have two cases :

Case 1 : When either b or c is = 1

In this case, the minimum value for the other will be 2. Therefore the maximum value of

\frac{1}{c} + \frac{1}{b} will be 1.5.

Also, since

\frac{1}{c} or

\frac{1}{b} can never be 0, the value of

\frac{1}{c} + \frac{1}{b} will always be greater than 1. Hence it can never be an integer.

Case 2 : When a and b are > 1

In this case, the minimum values that and b can take will be 2 and 3. Therefore the maximum value of

\frac{1}{c} + \frac{1}{b} will be

\frac{1}{2} + \frac{1}{3} =

\frac{5}{6}Also, since

\frac{1}{c} + \frac{1}{b} can never be 0, the values for

\frac{1}{c} + \frac{1}{b} will be greater than 0 but less than equal to

\frac{5}{6}. Hence it can never be an integer.

Since both cases in St. (2) tell us that

\frac{(\frac{a}{b})}{c} can never be an integer, St. (2) is sufficient.

Answer : B _________________

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