Digit found in 500

Probability Level pending

How many positive integers less than 500 can be formed using the numbers 1, 2, 3 and 5 for digits, each digit being used only once?

52 34 68 66

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1 solution

Saikat Bisaws
Sep 3, 2016

Single digit number = 4 Double digit number = 4××3 = 12 Three digit numbers = 3××3××2= 18 (∵∵ If Hundred's place is 5, then the number is greater than 500) Total = 34.

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