fozzzy wrote:

The three squares above share vertex A with AF = FE and AE = ED. If a point X is randomly selceted from square region ABCD, what is the probability that X will be contained in the shaded region?

A) 1/16

B) 1/12

c) 1/4

D) 3/16

4) 1/3

Lets say AD = 4, So, AE = 2 & AF = 1.

Area of ABCD = 16

Area of Square with side AE = 4

Area of Square with side AF = 1

Area of shaded region = 4-1 = 3

Probability =

\frac{Area of shaded region}{Area of ABCD} =

\frac{3}{16}Answer is D.

The figure is so deceiving easy way to trick a person! Thanks for the solution!