# Which one is not correct mathematical equation for Dalton's law of partial pressure?

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Which one is not correct mathematical equation for Dalton's law of partial pressure? Here p = total pressure of gaseous mixture

(1) p= χip, where

Pi = partial pressure of ith gas, χi = mole fraction of ith gas in gaseous mixture

(2) p= χipi°, where

χi = mole fraction of ith gas in gaseous mixture, pi° = pressure of ith gas in pure state

(3) p = p1 + p+ p3

(4) $p = n_1{RT\over V}+n_2{RT\over V}+n_3{RT\over V}$​​​​​​​​​​​​​​​​​