The lengths of two parallel sides of a trapezium are 21 cm a

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The lengths of two parallel sides of a trapezium are 21 cm and 9 cm. If its height is 10 cm, then what is the area (in cm^2) of the trapezium?

[2017 SSC CGL 12 AUG Shift 2]

A 35

B 75

C 150

D 225