Form the greatest and the smallest $7$-digit numbers (without repeating a digit) for these digits.

$5, 1, 7, 3, 4, 8, 9$: The Greatest number= ______, The Smallest number = ____

Rearrange the following in ascending order.

$86,931, 89,631, 86,139, 86,319$

Rearrange the following in ascending order.

$40,196, 14,691, 14,961, 40,961$

Which one of the following is the third largest number?

$237045, 823765, 6213, 99999$

Rearrange the numbers in descending order.

$2,41,694, 2,14,964, 2,41,964, 2,14,469$

Rearrange the following in ascending order.

$8,197, 8,917, 8,179, 8,971$