RRB Group-D Model Paper 12 with answers for online practice

The number of sides in the figures on the left is added to form a single figure with the same number of sides in the right.
Triangle (3) + Square (4) = Septagon (7)
Similarly,
Trapezium (4) + Hexagon (6) = Decagon (10)
Hence, the figure in option 2 is the correct answer.