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Data Sufficiency — Nitin's rank from the top in a class of 40 Statements: I. There are ten students between Nitin and Deepak. II. Deepak is twentieth from the top. Choose the correct sufficiency option.

Difficulty: Easy

I alone is sufficient while II alone is not sufficient
II alone is sufficient while I alone is not sufficient
Either I or II is sufficient
Neither I nor II is sufficient

Correct Answer: Neither I nor II is sufficient

Explanation:

Apply the gap
I: With a gap of 10 students, Nitin could be 10 ranks above or below Deepak. Without Deepak's rank ⇒ insufficient. II: Deepak is 20th, but Nitin's relation to Deepak is unknown ⇒ insufficient. Together: Nitin could be 10th or 30th from the top, both valid in a class of 40 ⇒ still not unique.

Answer
Neither I nor II is sufficient.

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Data Sufficiency — Nitin's rank from the top in a class of 40 Statements: I. There are ten students between Nitin and Deepak. II. Deepak is twentieth from the top. Choose the correct sufficiency option.

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