The next (4th) term of the A.P. $\sqrt{18}$, $\sqrt{50}$, $\sqrt{98}$, ... is:

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Step 1: $\sqrt{18} = 3\sqrt{2}$, $\sqrt{50} = 5\sqrt{2}$, $\sqrt{98} = 7\sqrt{2}$. Common difference $= 2\sqrt{2}$. Next term $= 9\sqrt{2} = \sqrt{162}$

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