1.

A basket has 3 Red and 11 Blue balls. There is another basket, which has 9 Red and 5 Blue balls. One ball is to be drawn from either of the two baskets. What is probability of drawing a blue ball?1). 3/72). 15/283). 5/74). 4/7

Answer»

PROBABILITY of choosing 1ST basket = ½

∴ Probability of choosing BLUE balls from 1st basket = ½ × 11/14 = 11/28

Probability of choosing 2nd basket = ½

∴ probability of choosing blue balls from 2nd basket = ½ × 5/14 = 5/28

∴ Probability of drawing a blue BALL,

⇒ 11/28 + 5/28

⇒ 16/28

⇒ 4/7


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