Question

Scrieti multimea numerelor naturale de doua cifre care se impart exact la 15.

Answer 1

{ 15,30,45,60,75,90}

...............

Answer 2

ab ( cu linie deasupra ) ∈  M_{15}

ab ( cu linie deeasupra ) ∈  { 15, 30, 45, 60, 75, 90 }

A = { 15, 30, 45, 60, 75, 90 }