Which of the following expression does not give root P mean square ...

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Which of the following expression does not give root
P mean square velocity -

W
(1) \( \left(\frac{3 R T}{M_{W}}\right)^{1 / 2} \)
(2) \( \left(\frac{3 P}{D M_{w}}\right)^{1 / 2} \)
(3) \( \left(\frac{3 P}{D}\right)^{1 / 2} \)
(4) \( \left(\frac{3 P V}{M_{w}}\right)^{1 / 2} \)
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