Four molecules of a gas have speeds $1, 2, 3$ and $4\, km/sec$. The value of root mean square speed of the gas molecules is
  • A$\frac{{\sqrt {15} }}{2}$
  • B$\sqrt {15}$
  • C$\sqrt {\frac{{15}}{2}} $
  • D$\sqrt {\frac{{30}}{2}} $
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