1.

\[\left( \frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}+\frac{1}{112}+\frac{1}{132} \right)\times \]\[0.2\times 0.5\times 0.10=?\]

A. \[\frac{5}{3000}\]
B. \[\frac{6}{1000}\]
C. \[\frac{7}{200}\]
D. \[\frac{7}{4000}\]
Answer» B. \[\frac{6}{1000}\]


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