Write the greatest 4-digit number using different digits with 6 in the ten's place?
Question 172
Make the greatest and smallest 5 digit numbers using different digits without repetition, in which 5 appears at ten's place.
Question 167
In a five-digit number, digit at ten's place is 4, digit at unit's place is one - fourth of ten's place digit, digit at hundred's place is 0, digit at thousand's place is 5 times of the digit at unit's place and ten thousand's place digit is double the digit at ten's place. Write the number.