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 principal sum?
Options:
A .  I and III only
B .  II and III only
C .  I and II only
D .  I and III only, or II and III only
E .  Any two of the three
Answer: Option E
Clearly, any two of the three will give us the answer.
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