Class 11

Math

Algebra

Permutations and Combinations

5-digit numbers are to be formed using 2, 3, 5, 7, 9 with out repeating the digit. If p be the number of such numbers that exceed 20000 and q be the number of those that lie between 30000 and 90000 the p : q is

- 6 : 5
- 3 : 2
- 4 : 3
- 5 : 3