Question

C={x|x €N,(x-1):10 şi x <61}​

Answer 1

Prin (x-1):10 eu (sper ca asta e) intelec ca x-1 se divide la 10 deci x-1 apartine multiplilor lui 10

x-1€ M 10 => x-1 € { 0,10, 20,30,40,50,60....}|+1

x<61

x€{ 1,11,21,31,41,51}

C={1,11,21,31,41,51}

Sper ca te-am ajutat!!