85.(a)

5 n5k)) (c) (anyme In,,n, k 21 and (nyb3m or n, (e) {anbme I n,,n,k2 1 and n + k = m} (f) {awed li,j,k,121, i= j, k=l) (g) {aivedl li,j,k,1 21, i = k, j = 1} (b) {dvedl I i,j, k, 1 21, i = 1, j = k} 85. Say whether the following sets are (i) regular, (i) contexte regular, or (ii) not context-free. Give justification ntext-free bu not (b) (a' lj is a power of 2) (c) fze (0,1)*lz represents a power of 2 in binary) (d) L(a'b'c*) (e) the set of all balanced strings of parentheses of three type, C) I1C