please explain me ..
I have doubts
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HEY MATE!
No. of blue balls are given here as x
no of red balls are 8.
now, total number of outcomes will be = red balls +blue balls=8+x
now, the probability of red ball =8/8+x
and probability of blue balls=x/8+x
Now, the question says that ratio of probability of red balls to probability of blue balls=2:5
i.e 8/8+x:x/8+x=2:5
by cross multiplication
2(x/8+x)=5(8/8+x)
by simplifying it we get x=20.
Hope it helped^_^
ankitrajputdevil:
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