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(1) A bag contains 5 red balls and some blue balls. If the probability of drawing ablue ball is double that of a red ball, then determine the number of blue ballsin the bag. |
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Answer» Let NUMBER of BLUE balls in the bag =x TOTAL no of balls in bag =5+x [No. of redball =5] Probability of drawing a blue ball = Total no of ball No. of blue ball
P(B)= 5+x x
Probability of drawing a Red ball = Total no of ball No. of red ball
P(R)= 5+x 5
Given, P(B)=2P(R) 5+x x
=2( 5+x 5
) x=10
Hence, no. of blue balls in the bag =10 |
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