Question

Suma cifrelor nr abc este 25. Calculati suma cifrelor nr abc +1

Answer 1

a+b+c=25

abc ∈ {799; 889; 898; 979; 988; 997}

abc+1 ∈{800, 890, 899, 980, 989, 998}

a+b+c+1 ∈ {8, 17, 26}