Answer the following.

Write all possible $3-$digit numbers formed from $2,0,6$ using each digit only once.

Q. Write all 3-digit numbers using 2, 3, 4, taking each digit only once.

Q. The largest $4$-digit and smallest $4$-digit numbers formed by using the digits $4,0,3,7$ each only once respectively are______.

Q. What is the sum of all the possible three-digit numbers that can be constructed using the digits 3, 4, and 5 if each digit can be used only once in each number?

Q. Write the greatest and the smallest numbers of 4 digits that can be formed using the digits 0, 8, 7, 5 ; using each digit only once.

Q. Find the sum of all unit place digit of the numbers formed with the digits $3,4,5,6,7$ taken all at a time using each digit only once in each number.