Largest 4 digit number formed by 6,7,5 and 9 is

Which of the following statements are true? The largest 4-digit number formed by 6,7,0,9 using each digit only once is 9706.

The largest 4-digit number formed by the digits 6, 7, 0, 9 using each digit only once is 9760.

The largest three digit number formed by the digit 8, 5, 9 is (a) 859 (b) 985 (c) 958 (d) 589

The largest three digit number formed by the digit 8, 5, 9 is 859 (b) 985 (c) 958 (d) 589

Write the greatest and smallest six digit numbers formed by all the digits 6,4,0,8,7,9, and find sum and difference of those numbers.

The largest number form by digits 4,7,9 and 0 (taking all the digits and some digits may be repeated) is

The number of 9digit numbers formed from {5,6,7,8,9} so that each digit that appears in the number,repeats atleast three times is

Consider the digits 3,5,7,9. Which is the number of 5 digit numbers formed by these digits in which each of these four digits appears?