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secondary 4 | E Maths
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Hi I really do not understand question a(i)the part I don’t understand is why for example 5/10 is multiplied by 4/9 like why is it multiplied by 4/9 and so for the others why is it multiplied by 2/9 and 1/9 someone please explain to me thank you so much!
Date Posted: 4 years ago
Views: 467
The probability of drawing a blue ball the first time is 5/10.
This is because there are 5 blue balls out of 10 balls at first.
However, the removal of this ball results in there being 4 blue balls out of 9 balls.
The second time a blue ball is drawn, its probability is 4/9.
In short, out of the first 5/10 probability, 4/9 of this probability is for the second ball.
Hence, we multiply the two results to find the probability of drawing two blue balls in a row.
This is because there are 5 blue balls out of 10 balls at first.
However, the removal of this ball results in there being 4 blue balls out of 9 balls.
The second time a blue ball is drawn, its probability is 4/9.
In short, out of the first 5/10 probability, 4/9 of this probability is for the second ball.
Hence, we multiply the two results to find the probability of drawing two blue balls in a row.
A similar idea applies for drawing the other balls of the same colour.
Thank u so much for ur clear explaination really helped!!
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