10. In a survey of 1000 households, 275 owned a home computer, 455 a video, 405
two cars, and 265 households owned neither a home computer nor a video nor two cars.
Given that 145 households owned both a home computer and a video, 195 both a video
and two cars, and 110 both two cars and a home computer, find the number of house-
holds surveyed which owned
(a). a home computer, a video and two cars.
(b). a video only.
(c). two cars, a video but not a home computer.
(d). a video, a home computer but not two cars.
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Answer:
. A box contains 5 red marbles, 8 white marbles and 4 green marbles. One marble is taken out of
the box at random. What is the probability that the marble taken out will be (i) red ? (ii) not
green?
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1
Answer:
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