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L1 = {a1^1 , a2^2, a3^3............} ={a1,a4,a9 ...... } which is not in AP {Arithmetic progression}

L2 = {a1^1, a4^2, a9^3..........} not in AP.

L3 ={a2^1, a3^1, a4^1.........} put n=1 and m>n

regular expression for L3= {aa+}

hence, L3 is regular.

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