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Alka gupta Best Answer
U(27) have 18 elements ={ 1,2,4,5,7,8,10,11,13,14,16,17,19,20,22,23,25,26} hence this group is isomorphic to Z(18) group Z(18) is cyclic group and it's divisors is 6 hence total number of subgroups of U(27) is 6 , and it have unique subgroup of each order that is only one subgroup of order 6 in U(27) Ans - one