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from a bag containing 8 green and 5 red balls,three are drawn one after the other .the probability of all three balls beings green if the balls drawn are replace before the next ball pick and the balls drawn are not replaced , are respectively

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What is the value of (2^2 + 4^2 + 6^2 + ... + 20^2 )?

A) 542 B) 756 C) 1540 D) 968
A semicircle is drawn with Ab as its diameter.From C, a point on AB, a line perpendicular to AB is drawn,
meeting the circumference of the semicircle at D.Given That AC = 2cm and CD = 6 cm the area of the semicircle (in sq. cm) will be: