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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Alka gupta
you can use this as a result....if any two subgroups are given then product of two subgroups is subgroup of G if HK=KH and vice versa this theorem based example never asked in exam. so only remember this as a result Note- if group is cyclic then no need this condition HK=KH