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R<I
D:9=C+R
R < 9
R-nr natural =>R={1,2,3,4,5,6,7,8}
S=1+2+3+4+5+6+7+8
S=(1+8)*8/2
S=9*4
S=36
D:9=C
Resturile posibile sunt 0,1,2,3,4,5,6,7,8
S=1+2+3+4+5+6+7+8=36