Find the greatest numberthat can be formed outof the digits 9, 0, 8, 7, 9.

we may say the procedure of forming the greatest number is as follows

a) The smallest digit is placed at one's place

b) The next greater digit is placed at tens place

c) The next greater digit is placed at hundreds place and so on

d) The greatest digit is placed at the highest place of the number

Hence by using the above concept greatest number that can be formed  out of the digits 9,0,8,7,9 

Is = 99870