Mathematics

Problem

## Detection Note The validator flagged this with error `TABLE_FORMAT`: > Spec uses LaTeX aligned environment (flagged as table/array-style formatting) and includes exam metadata '[Single Correct Type, 2017 Adv.]'. ## Question to Fix Let

O

be the origin and let

PQR

be an arbitrary triangle. The point

S

is such that

\vec{OP} \cdot \vec{OQ} + \vec{OR} \cdot \vec{OS} = \vec{OR} \cdot \vec{OP} + \vec{OQ} \cdot \vec{OS} = \vec{OQ} \cdot \vec{OR} + \vec{OP} \cdot \vec{OS}.

Then the triangle

PQR

has

S

as its a. centroid b. orthocentre c. incentre d. circumcentre

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