B = 2/5 +3 /5 : ( 1 - 1 /10 )
B= 5 /5 : 0/10
B= 5 x 2 /5 x 2 : 0 / 10
B = 10/10 :10/10
B=1 / 1
B= 1
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B = 2/5 +3 /5 : ( 1 - 1 /10 )
B= 5 /5 : 0/10
B= 5 x 2 /5 x 2 : 0 / 10
B = 10/10 :10/10
B=1 / 1
B= 1