| 52688 | If n | Medium | |
| 52845 | How many positive integers less than 600 can be formed using the… | Medium | |
| 52907 | What is the least number of digits (including repetitions) needed to express… | Medium | |
| 52943 | If a number is formed by writing integers 1 to 150 one… | Medium | |
| 52946 | How many four digit numbers have no repeat digits, do not contain… | Medium | |
| 52949 | The sum of the digits of a two digit number is 10 | Medium | |
| 53092 | The difference between a 8 digit number and the number formed by… | Medium | |
| 53167 | S is the infinite sequence S1 = 2, S2 = 22, S3… | Medium | |
| 53247 | how many distinct 3 digit number less than 10 | Medium | |
| 53285 | In a two digit number, the digit in the units place is… | Medium | |
| 53368 | How many positive even integers less than 100 contain digits 4 or… | Medium | |
| 53522 | (((13!)^16)-((13!)^8))/(((13!)^8)+((13!)^4))=a then what is the units digit for a/((13!)^4)= | Medium | |
| 53564 | A 3-digit positive integer consists of non zero digits | Medium | |
| 53636 | How many 4 digit numbers can be formed with the digits 0… | Medium | |
| 53649 | Each of the positive integers a and c is a four-digit integer | Medium | |
| 53762 | The sum of digits of a two digit number is 12,The difference… | Medium | |
| 53993 | Of the three- digit integers greater than 700, how many have two… | Medium | |
| 53997 | What is the units digit of the product of the first 15… | Medium | |
| 54002 | A five-character password consists of one letter of the alphabet and four… | Medium | |
| 54090 | Take a number 'x' and follow these steps : 1 | Medium | |
| 54153 | What is the unit digit in 7105 | Medium | |
| 54244 | There are 6 distinct letters of the English alphabet and 4 distinct… | Medium | |
| 54349 | An integer is said to be “diverse” if no two of its… | Medium | |
| 54404 | How may 5 digit odd numbers can be formed from 1 2… | Medium | |
| 54626 | How many four-digit numbers that do not contain the digits 2, 3… | Medium | |
| 54661 | How many three digit even numbers do not use any digit more… | Medium | |
| 54746 | If the position of the first, sixth digits of the number 2796543018… | Medium | |
| 54834 | If the two-digit integers M and N are positive and have the… | Medium | |
| 54906 | What is the units digit of (493) (915) (381) (756) (22) | Medium | |
| 54907 | If n = 7^11 – 7, what is the units digit of… | Medium | |
| 54947 | How many trailing zeros will be there after the rightmost non-zero digit… | Medium | |
| 55047 | find how many 4 digits no | Medium | |
| 55050 | How many four digit numbers have no repeat digits, do not contain… | Medium | |
| 55202 | What are the unit's digits of 369, 6864, 4725 respectively | Medium | |
| 55203 | X and Y are positive two-digit integers such that the tens digit… | Medium | |
| 55364 | find 3 consecutive odd integers, all less than 100, such that the… | Medium | |
| 55370 | A five-character password consists of three letter of the alphabet and two… | Medium | |
| 55430 | 1 boy forgot the last digit of a 7 digit telephone no | Medium | |
| 55432 | A popular website requires users to create a password consisting of digits… | Medium | |
| 55479 | The sum of the digits of a two-digit number is 15 and… | Medium | |
| 55700 | For a certain alarm system, each code is comprised of 5 digits… | Medium | |
| 55713 | If the tens digit of positive integer x is 2 and the… | Medium | |
| 55814 | If pq represents a positive two digit number, where p and q… | Medium | |
| 56069 | How many different positive integers exist between 10^9 and 10^10, the sum… | Medium | |
| 56088 | How many different 9 digit numbers can be formed from the number… | Medium | |
| 56101 | Which of the following is closest to the difference between sum of… | Medium | |
| 56148 | How many four digit numbers have no repeat digits, do not contain… | Medium | |
| 56270 | What is the 100th digit of (3!*5 | Medium | |
| 56466 | find the number of 5 digits numbers can be formed using the… | Medium | |
| 56501 | In a two digit number, the digit in the units place is… | Medium | |