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For every real number x, let f(x)=(x)/...

For every real number x, let ` f(x)=(x)/(1!)+(3)/(2!) x^(2)+(7)/(3!) x^(3) +(15)/(4!)x^(4)+…`.
Then the equation `f(x)=0` has

A

no real solution

B

exactly one real solution

C

exactly two real solutions

D

infinite number of real solutions

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