How many 6-digit numbers contain exactly 4 different digits?
48605
Distinct digits in a combination of 6 digits
90068
Calculating the number of times a digit is written when given two numbers
80771
spelling numbers
6138
Combination of a 4-digit number
132175
How many $5$-digit numbers with distinct digits are divisible by 3 (and generalize)
137573
How many different numbers can you make with the following digits?
45788
$n$-th digit in the sequence of natural numbers
148703
Permutations with repeating digits
89513
How to get the separate digits of an int number?
154561
Finding number of ways of selecting 6 gloves each of different colour from 18 gloves?
119386
How many ternary strings of length 4 have exactly one 1?
121960
How many numbers from $1$ to $2^n$ will have $``11"$ as substring in binary representation?
105140
To find the total no. of six digit numbers that can be formed having property that every succeeding digit is greater than preceding digit.
99912
Any digit written $6k$ times forms a number divisible by $13$
141111
Equation that can easily be changed to output the digit in 1's, 10's ,100's etc?
59788
Let T = {1000,1001...,9999}. How many numbers have at least one digit that is 0...
52043
Number of binary numbers with two consecutive zeros