Posted by gab on Saturday, July 21, 2012 at 4:06pm.
Assume spinning of both spinners are random and independent of each other.
Red spinner is labeled 1 to 6, consequently the event of spinning less than three is 1 or 2 (two outcomes) out of 6 possible outcomes for a probability of 2/6=1/3.
Blue spinner has 4 sectors (4 possible outcomes). The event of spinning B or D means 2 outcomes out of the 4 possible, with a probability of 2/4=1/2.
Since the spinners are independent, the joint probability of getting both events happening is the product of the two individual probabilities.
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