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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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Solution



Given:
    • √Z > 0
      o Hence, Z > 0

To find:
    • √Z > Z

Analysing statement 1
“Z is greater than Zero”
    • Z > 0

For 0 < Z < 1
    • √ Z > Z

For Z = 1
    • √Z = Z

For Z > 1
    • √Z < Z

Hence, statement 1 is not sufficient to find the answer.

Analysing statement 2

“Root Z is less than 1”
    • Z < 1

Hence, 0 < Z < 1
    • √Z > Z

Thus, statement 2 is sufficient to find the answer.

Hence, the correct answer is B.
Correct answer: Option B
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This problem provides interesting insights.
sqrt 1 = 1 (the output is equal to the original)
sqrt 2 = 1.4 (the output is less than the original) (try any number above 1; the output is less than the original)

But,

sqrt 1/4* = 1/2 (the output is greater than the original)
*any number less than 1 but greater than 0.
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