a bag contains 20 white balls of different colours of probability of drawing a black balls 4 by 7 the number of black balls in the bag is
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we see that bag contains 20 no of different colors of balls and probability is 4/7 ,on finding lcm
20 and 7 lcm is 140
getting the terms simplified with same demoniator
4/7 × 20 answer comes 11.428571428
it means in a bag of 20 balls of different colours there are 11(in non decimal form)
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