You flip 3 coins 20 times and record the number of heads. The results are listed below. Complete the frequency table.
A: a=4,b=9,c=5,d=2
B: a=3,b=8,c=6,d=3
C: a=5,b=6,c=7,d=2
D: a=2,b=5,c=10,d=3



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