Question

cum se afla multiplul de 7?

Answer 1

M7 apartine { 1x7, 2x7, 3x7, 4x7,    , nx7 / n apartine N* }, adica
M7 apartine { 7, 14, 21, 28, ....}

Answer 2

M7={1×7,2×7,3×7,4×7}
M7={7,14,21,28}