(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2013)*(1-1/2014)

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(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2013)*(1-1/2014)

(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2013)*(1-1/2014)
(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2013)*(1-1/2014)

(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2013)*(1-1/2014)

(1-1/2)*(1-1/3)*(1-1/4)*……*(1-1/2013)*(1-1/2014)
=(1/2)(2/3)(3/4)(4/5)……(2012/2013)(2013/2014)
=1×(1/2014)
=1/2014