Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.
What is the two-digit number?
Options:
A . I and II only
B . I and III only
C . All I, II and III
D . I, and either II or III
E . Even with all I, II and III, answer cannot be give.
Answer: Option E
Let the tens and units digit be x and y respectively.
I. (10x + y) - (10y + x) x - y = 3.
II. x - y = 3.
III. x - y = 3.
Thus, even all the given three statements together do not give the answer.
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