# Plzz. Answer.. Q. No. 10 to 12 ​Q10. In figure ​$\angle$PQR = 100° where P, Q and R are points on the circle with centre O. Find ​$\angle$POR in the quadrilateral Q11. The length, breadth and height of a room are 5 m, 4 and 3 m respectively. Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs.7.50 per m2. Q12. Two coins are tossed simultaneously 500 times, and we get            Two heads : 105 times,              One head : 275 times,         Find the probability of occurrence of each of these events.

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