A bag contains 3 black, 4 white and 5 red balls. One ball is drawn at random. Find the probability that it is either black or red ball:
P(black ball)=3/12
P(red ball)=5/12
P(black or red)=3/12+5/12=2/3
Find the range and mode of the data 17, 18, 28, 19, 16, 18, 17, 29, 18
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