A very simple qn on geometrical isomers

[nil1996]

Homework Statement

Can anybody explain how this compound can have 3 geometrical isomers isomers.

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Homework Equations

NO

The Attempt at a Solution

The compound contains two double bonds hence will have 2 pairs of cis-trans isomers.That means it will have four geometrical isomers.But my book says the isomers are 3.

Plz help

 

[DrClaude]

What is the symmetry of the molecule?

 

[chemisttree]

Are any of the 4 you identified superimposable?