Question

5 digit numbers are to be formed using 2, 3, 5, 7, 9 without repeating the digits. If p be the number of such numbers that exceed 20000 but are less than 80000 and q be the number of such numbers that lie between 30000 and 90000, then p : q is

• A. 3 : 2
• B. 5 : 3
• C. 4 : 3
• D. 6 : 5
  

Answer 1

The correct option is C 4 : 3

p = 4(4!), q = 3(4!)
$\therefore$ p : q = 4 : 3