a box contains 7 green, 5 yellow and 8 blue coloured balls. one ball is taken out from a box at random. what is the probability that the ball taken out is
1st. green coloured
2nd. blue coloured
3rd. not yellow coloured
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Answer:
1. probability of green ball= 7/20
2. probability of blue ball= 8/20=2/5
3. not yellow ball=7+8/20
=15/20
=3/4
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