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z6=(0,1,2,3,4,5) but z12={0,1,2,3,4,5,6,7,8,9,10,11} inverse of 3 is 9 bcz 3+9=0but 9 is not element of z12
in z6 3 =9 bro lska matlab ki 9 h to
3=9 if composition is +6 but composition is +12
yes
group and subgroup ki composition same hota hai