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Q1:
What is the two-digit number?
I.  The difference between the two digits is 9.
 II.  The sum of the digits is equal to the difference between the two digits.

A I alone sufficient while II alone not sufficient to answer

B II alone sufficient while I alone not sufficient to answer

C Either I or II alone sufficient to answer

D Both I and II are not sufficient to answer

E Both I and II are necessary to answer