(d) The digits of the number 1,2,2,3,6,7,8 can be rearranged to give many different 7- digit numbers. Find how many different 7-digit numbers can be made if

(i) there are no restriction on the order of the digits,

(ii) the digits 1,3, 7 (in any order) are next to each other,

(iii) these 7-digit numbers are even