Resistance $$=1500 \\Omega$$ $$\\displaystyle = 1500 \\: ohm$$$$\\displaystyle = \\dfrac {1}{1500} \\: S$$Cell constant is the ratio of conductivity to conductance.Cell constant $$\\displaystyle = \\dfrac {0.146 \ imes 10^{-3} \\: S/cm}{\\dfrac {1}{1500} S} = 0.219 \\: /cm$$