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P Q is a tangent drawn from a point P...

`P Q` is a tangent drawn from a point `P` to a circle with centre `O` and `Q O R` is a diameter of the circle such that `/_P O R=120o` , then `/_O P Q` is `60o` (b) `45o` (c) `30o` (d) `90o`

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The correct Answer is:
`30^@`
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