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In the figure, O is the centre of a circle,PQL and PRM are the tangents at the points Q and R respectively and Sis a point on the circle such that `angle SQL =50^@ and angle SRM = 60^@`. Then , `angle QSR` is equal to

A

`40^@`

B

`50^@`

C

`60^@`

D

`70^@`

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The correct Answer is:
D
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