sequence Fnconverges to L hence by definition for given € 0 there exist N such that |Fn-L| < €1/3 whenever (nN) |F3n - L3 | |Fn - L|3 by Cauhy Schwartz inequality. |F3n - L3 | |Fn - L|3 < € whenever (nN) Hece by definition F3 converges to L3. Solution sequence Fnconverges to L hence by definition for given € 0 there exist N such that |Fn-L| < €1/3 whenever (nN) |F3n - L3 | |Fn - L|3 by Cauhy Schwartz inequality. |F3n - L3 | |Fn - L|3 < € whenever (nN) Hece by definition F3 converges to L3..