P is a two-digit integer, which can be written as 30a + b, w

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Source: e-GMAT

P is a two-digit integer, which can be written as 30a + b, where a and b are positive integers. Find the remainder, when P is divided by 3.

1) \(a=3\).
2) \(b^3-5b^2-14b=0\).

The OA is B