Question 360786
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Hi, 
21 numbers from  1 to 21
10 even numbers: 2,4,6,8,10,12,14,16,18,20
7 numbers which are multiple of 3: 3,6,9,12,15,18,21
P(even 'or' multiple of three) = P(even) + P(multiple of three)
P(even 'or' multiple of three) = 10/21 + 7/21 = 17/21