Asequence of transformations maps ∆abc onto ∆a″b″c″. the type of transformation that maps ∆abc onto ∆a′b′c′ is

.when ∆a′b′c′ is reflected across the line x = -2 to form ∆a″b″c″,
of ∆a″b″c″ will have the same coordinates as b′.

The type of transformation that maps ∆ABC onto ∆A′B′C′ is a
reflection transformation 
The triangle is reflected across the line y = 0.

When ∆A′B′C′ is reflected across the line x = -2 to form ∆A″B″C″,
B'' vertex 
of ∆A″B″C″ will have the same coordinates as B′

The probability of picking 2 green markers is 2/10