Easy product :)

Algebra Level 2

x=(1122)(1132)...(11152) x = (1-\frac { 1 }{ 2^{ 2 } } )(1-\frac { 1 }{ { 3 }^{ 2 } } )\quad ...\quad (1-\frac { 1 }{ { 15 }^{ 2 } } )

If x x can be written as ab \frac{ a}{b} where aa and bb are positive coprime integers, what is the value of a+ba+b?

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