p, q and r are three positive integers greater than 1. If pqr = 231, what is the value of p + q + r?….

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p, q and r are three positive integers greater than 1. If pqr = 231, what is the value of p + q + r?

Options :-

1. 9
2. 15
3. 21
4. 27
5. cannot be determined

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