Questions
5-digit numbers are formed using 2, 3, 5, 7, 9 without repeating the digits. If p is the number of such numbers that exceeds 20000 and q be the number of those that lie between 30000 and 90000 then p : q is:
detailed solution
Correct option is B
Any number 5-digit formed by 2, 3, 5, 7, 9, exceeds 20000. Therefore,
A number will lie between 30000 and 90000 if it begins with 3, 5 or 7
Thus
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