The number of numbers  strictly between 5000 and 10000 can be formed using the digits 1, 3, 5, 7, 9
Without repetition is

No of numbers between 5000 and 10000 can be formed using the digits 1, 3, 5, 7, 9 wihtout reputation − − − − The 1st place fill by 5 or 7 or 9 in 3 ways. Remaining 3 poles can be filled by other 4 digits in${ }^4{P}_3$ ways
Required no of ways $=3{\times }^4{P}_3=3\times 4!=72$