box A contains 3 white and 4 red balls. box B contains 4 white and 5 black balls. If a box is chosen at random and a ball is drawn from it. what is the probability that the ball so drawn is white?
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Step-by-step explanation:
Total no. of balls=7 white+ 4 red + 5 black
= 16 balls
probability that the ball so drawn is white= no. of white balls÷ total no. of balls
=7/16
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