A box contains 10 green,7 red and 3 blue coloured balls. If a single ball is chosen at random from the box,find the probability of a red ball
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Answer: 7/20 because the total no. of balls is 20 (10+7+3 balls) out of which there are 7 balls which are red coloured i.e. any random ball out of those 7 red balls can be taken out of the 20 overall balls.
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