Math
posted by Judy .
Each digit of a fourdigit PIN can be any number from 0 to 9. What is the percentage of PINs with no digit repeated more than twice?

Math 
MathMate
In a four digit number, a digit repeated twice means 3 of the numbers are the same.
Repeated more than twice means repeated 3 times, or all four digits are the same.
PINs with no digit repeated more than twice would therefore mean pins which do not have identical digits.
Out of 10000 pins, there are only 10 PINs with identical digits, so the probability is
9990/10000.
Reduce the fraction for the proper answer.
Respond to this Question
Similar Questions

math
need help with math word problems. just don't understand. What is the number? 
Math
i am a four digit number. all of my digits are different. my first digit is twice my fourth digit. my second digit is twice my first digit.my last digit is twice my third digit. the sum of my digits is 15. what number am i? 
math
i have a six digit question my 100 thousands is one less than my ones digit,eight greater than my thousands digit,twice my tens digit and four times my hundreds digit,my ten thousand digit is zero,what number am i 
4th grade
i am a 5 digit number my tens digit is the sum of my hundreds digit and thousands digit. my tens digit is twice my ones digit.my hundreds digit is 1 more than zero.my thousands digit is seven times my hundreds digit.my ten thousands … 
math
The number uses every number 09 the numbers are used only once the fourth digit is 4 the first digit in the billions place is 3 the 5 is next to the last digit the sixth digit is 7 the digit after 3 is 9 the digit before 5 is 2the … 
mathpermutuation
a four digit serial number needs to be created using digits 09. first digit is even , no digit is repeated , last digit is odd 
Math
i am a 4 digit number between 3000 and 4000.My ones digit is twice my thousands digit.My hundreds digit is the same as my ones digit and my tens digit is one less than the hundreds digit.If the sum of my digit is twenty,what number … 
Math
What is the greatest six digit even number that matches all of the clues The ten thousands digit is twice the tens digit The hundred thousands digit is more than six The thousands digit can be divided by the ones digit No digit is … 
Math
In a three digit number, the digit is twice the units digit and the hundreds digit four times the unit digit .also,the sum of its digits is14 .find the number 
math
the hundred thousand digit of a six digit even number is 3 more than the thousand digit which is twice the ones digit .give atleast four numbers that satisfy the given condition