Answer:
18
Step-by-step explanation:
3 colors: red, turquoise, or green
2 seats: leather or cloth
3 interior color: black, tan, or grey
3*2*3 = 18 Possible trucks:
{red, leather, black}
{red, leather, tan}
{red, leather, grey}
{red, cloth, black}
{red, cloth, tan}
{red, cloth, grey}
{ turquoise, leather, black}
{ turquoise, leather, tan}
{ turquoise, leather, grey}
{ turquoise, cloth, black}
{ turquoise, cloth, tan}
{ turquoise, cloth, grey}
{green, leather, black}
{green, leather, tan}
{green, leather, grey}
{green, cloth, black}
{green, cloth, tan}
{green, cloth, grey}