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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
  1. 3 : 2
  2. 5 : 3 
  3. 6 : 5
     
  4. 4 : 3


Solution

The correct option is D 4 : 3
p = 4(4!), q = 3(4!)
 p : q = 4 : 3

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