1. The statement I alone is sufficient to answer the question, but the statement II alone is not sufficient. 
  2. The statement II alone is sufficient to answer the question, but the statement I alone is not sufficient. 
  3. Both the statements I and II together are needed to answer the question.
  4. Either statement I alone or statement II alone is sufficient to answer the question 
  5. Neither statement I nor statement II is sufficient to answer the question
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1 Answers

Option 5 : Neither statement I nor statement II is sufficient to answer the question

From statement I

Geometric mean of two units x and y = √xy

⇒ √xy = 8

⇒ xy = 64

⇒ x = 64/y

From statement II

Arithmetic mean of two units x and y = (x + y) / 2

⇒ x + y = 20

Using both the statements

⇒ 64/y + y = 20

⇒ 64 + y2 = 20y

⇒ 64 + y2 – 20y = 0

Y could be 16 or 4 if y is 16 x must be 4 and if y is 4 then x must be 16 so we cannot answer the question and we need more data to answer the question.

Since We cannot get the answer from the statements I and II together,

∴ Neither statement I nor statement II is sufficient to answer the question
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