December 2018 2 15 Report
W ciągu arytmetycznym  a_{1} = \frac{1}{2} i a_{4} =2. Różnica tego ciągu wynosi:

A.  \frac{1}{2}

B.  \frac{3}{2}

C.  -\frac{1}{2}

D.  \frac{3}{4}

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