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Lesson: Data Sufficiency Challenging - 14t03

Tough Content: Example 2

[Page 14 of 24]

Take a look at this question. Again, the first thing we’ll do is evaluate the question stem.

If a and b are positive integers and a + b > ab, what is the value of a?

1)

2) ab ? a

Focus on the question stem. Do you recognize the math concept that this is testing? Type it into the Text Box, and click Continue.

This question is testing rules.

Review Statement 1 below. Is it sufficient or insufficient? Select the correct answer and then click Continue.

1)

  Sufficient Insufficient    

Countinue

This tells us nothing we didn’t already know. Whenever you see in a statement what could possibly be a reworking of an equality or inequality in the question stem, you need to make sure that the two expressions are different. If they’re not, if the statement is merely a duplication of the stem!

In this case, the expression in Statement (1) is simply a + b > ab divided through by b and rewritten in reverse order. If we multiplied each term in the expression by b, we’d end up with the same expression as in the question stem. Insufficient.

Let’s look at Statement (2)…

Countinue

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