Make the greatest and the smallest 4 digit numbers by using any one digit twice:
(i) 6, 3, 2
(ii) 1, 0, 6

i) The greatest and smallest $4-$ digit number by using any one digit twice from $6,3,2$ are $6632$ and $2236$.

ii) The greatest and smallest $4-$ digit number by using any one digit twice from $1,0,6$ are $6610$ and $1006$.