What is the greatest 15-digit number with a nine in the hundred trillions place 1 in the millions place and and 3 in the thousands place that use each of the digit 5-8 times?

Answer 1

Since the three digit, 1 3 and 9 must be used 5-8 times in a 15 digit number, each must be used exactly 5 times. Putting the numbers in descending order, but subject for the three specified locations, the answer is: 999,993,331,313,111