How old is Sachin in 1997?
I. Sachin is 11 years younger than Anil whose age will be a prime number in 1998.
II. Anil's age was a prime number in 1996.

if the question cannot be answered even with the help of both the statements taken together.

if the question can be answered by any one of the two statements.

if each statement alone is sufficient to answer the question, but not the other one (e.g. statement I alone is required to answer the question, but not statement II and vice versa.

if both statements I and II together are needed to answer the question.