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Whether the following two are same  or not     a*b*     and     amb{where  m >=0 and n>=0 }

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Aditi Tiwari asked Dec 24, 2015
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$$L_1 = \left \{a^n \,c\, b^n \right \} \cup \left \{ a^{2n} \,d\, b^n \right \}$$$$L_2 = \left \{a^{3k} \, b^{3k} \mid k \geq 0 \right \}$$