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2014-02-12T10:00:22+01:00
C = 1- (2/3 +1/4)
    = 1- ( 8/12 +3/12)
    = 1 - 11/12
    = 12/12 -11/12
    = 1/12

D = 3- 5/2 +1/5
   = 30/10 -25/10 +2/10
   = 7/10