Question

A={x|x apartineM10 si x< 50

Answer 1

$A=\left \{ x\:|\:x\:\in\:M_{10} \:si\:x<50\right \}$

$M_{10}<50=\left \{ 0,10,20,30,40 \right \}$

$= > x \: \in \: \left \{ 0,10,20,30,40 \right \}$

$= > A=\left \{ 0,10,20,30,40 \right \}$