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Answer:
You could calculate it directly, by counting the numbers that are multiples of 2 or 3, but more useful is learning this rule:
P(A or B) = P(A) + P(B) -P(A and B).
This lets you calculate:
P(even or multiple of 3) = P(even) + P(multiple of 3) -P(even and multiple of 3)
= 1/2 + 6/20 -3/20 =13/20.
Note that being a multiple of 2 and 3 just means being a multiple of 6.
Step-by-step explanation:
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