Get detailed explanations to advanced GMAT questions.

If 0 < x < 2, which of the following must be greatest?

Option A:

x

Option B:

x^2

Option C:

2x

Option D:

x + 2

Option E:

2^x

Option D is the correct answer.

Plugging In for MUST-BE type Questions:

x = 1

A. x = 1

B. x^2 = 1^2 = 1

C. 2x = 2(1) = 2

D. x + 2 = 1 + 2 = 3 So this is the greatest. So eliminate all other answer choices.

E. 2^x = 2^1 = 2

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