Related Questions

A bag contains 6 red balls, 11 yellow balls and 5 pink balls. If two balls are drawn at random from the bag one after another, what is the probability that the first ball is red and the second ball is yellow?
A 1/14
B 2/7
C 5/7
D 3/14
A sport goods store ordered an equal number of white and yellow tennis balls. The tennis ball company delivered 30 extra tennis ball, making the ratio of white balls to yellow balls 6:5, How many tennis ball did the sport goods store originally order?
A 150
B 180
C 300
D 330
A bag contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the bag; If at least one ball is to be included in the draw?
A 64
B 32
C 128
D 256
A box contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at least one black ball is to be included in the draw?
A 32
B 48
C 64
D 96
There are 87 balls in a jar. Each ball is painted with at least one of two colors, red or green. It is observed that 2/7 of the balls that have red color also have green color, while 3/7 of the balls that have green color also have red color. what fraction of the balls in the jar has both red and green colors?
A 6/14
B 2/7
C 6/35
D 6/29
A bag contains five red balls, twelve blue balls and eight green balls. If one ball is drawn from the bag what is the probability that the ball will not be green?
A 1725
B     825
C    125
D 18
The ratio of the number of red balls , to yellow balls , to green balls in an urn is 2 : 3 : 4 . What is the probability that a ball chosen at random from the urn is a red ball ?
A 2/7
B 510
C 5/9
D 2/9
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
A Metalliferrous ores
B Non-metallic ores
C Basic slags
D Asbestos & mica
A box contains 21 balls numbered 1 to 21 . A ball numbered 1 to 21 . A ball is drawn and then another ball is brawn without replacement . What is the probability that both balls are even numbered?
A 2/7
B 3/14
C 8/21
D 5/21
A jar contains red balls and green balls in the ratio 3:1. If the jar contains only the two types of balls, which of the following cannot be the number of balls in the jar ?
A 96
B 80
C 72
D 54

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