Răspunsuri

2014-08-09T15:37:02+03:00
2014-08-09T15:40:42+03:00
D:I=C, +R
R < I 
R < 9
D,I,C,R -numere naturale        =>R={0,1,2,3,4,5,6,7,8}

S=0+1+2+...+8

S=(0+8)*9/2

S=8*9/2=

S=4*9 =36