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What is the principal sum? I. The sum amounts to Rs. 690 in 3 years at S.I. II. The sum amounts to Rs. 750 in 5 years at S.I. III. The rate of interest is 5% p.a.

I and III only
II and III only
I and II only
Any two of the three

Correct Answer: Any two of the three

Explanation:

Clearly, any of the three will give us the answer

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