Option : (C)
Given,
ABCD is a parallelogram,
Angles of quadrilateral 4x , 7x , 9x , 10x
= 4x+7x+9x+10x = 360°
[angle sum property of quadrilateral]
= 30x = 360°
= x = \(\frac{360°}{30}\) = 12°
Hence,
Sum of smallest and largest angles = 4x+10x
= 4×12+10×12
= 48°+120° = 168°