IMO D
AA. (5555X - X can be 1,2,3,4,6,7,8,9) - no. of possible arrangement= 8 * 5!/4! =40
BB.5555X - X can be 0 also . In this case no. of arrangement = 4!/3!=4
Total arrangements with 5555X = 44
Total possible is 90,000
Hence - D
OA please.:hmm:
Thanks