## Number of ways to arrange K different objects taking N objects at a time

Given two integers K and N, the task is to count the number of ways to arrange K different objects taking N objects at a… Read More »

- Check whether N is a Factorion or not
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- Find the number of strings formed using distinct characters of a given string
- Queries for the product of first N factorials
- Count of N-digit numbers with all distinct digits

Given two integers K and N, the task is to count the number of ways to arrange K different objects taking N objects at a… Read More »

Given an array arr[] which contains the frequency of the digits (0-9), the task is to find the count of numbers possible using each digit… Read More »

Given an integer N, the task is to check whether N divides the sum of the factorials of its digits. Examples: Input: N = 19… Read More »

Given a number ‘N’. Check whether factorial of ‘N’ is divisible by the sum of first ‘N’ natural numbers or not? If divisibility is possible,… Read More »

Given an integer N, the task is to find whether fact(N) is divisible by sum(N) where fact(N) is the factorial of N and sum(N) =… Read More »

Given the NxN grid of horizontal and vertical roads. The task is to find out the number of ways that the person can go from… Read More »

Given an integer Y, find the smallest number X such that X! contains at least Y trailing zeros. Prerequisites – Count trailing zeroes in factorial… Read More »

Given two numbers n and r, the task is to find the value of nPr. nPr represents n permutation r which is calculated as n!/(n-k)!.… Read More »

Given two integer N and M, the task is to find the number of distinct numbers having N 0’s and M 1’s with no leading… Read More »

Given an array with N positive integers. Find the GCD of factorials of all elements of array. Examples: Input : arr[] = {3, 4, 8,… Read More »

Given two positive integers B and N. The task is to find the number of trailing zeroes in b-ary (base B) representation of N! (factorial… Read More »

Given an integer N, the task is to find the number of trailing zeroes in the base 16 representation of the factorial of N. Examples:… Read More »

Given three positive integers N, A and B. The task is to count the numbers of length N containing only digits A and B and… Read More »

Given a positive integer N, the task is to check if N is a Factorial prime or not. If it is a factorial prime then… Read More »

Given an array arr[] of N integers and number of queries Q. The task is to answer three types of queries. Update [l, r] –… Read More »