Calculate the number of ways to arrange k items from n items (nPr). Shows the step-by-step permutation calculation. Everything runs locally in your browser — nothing is uploaded.
Calculate the number of ways to choose k items from n items (nCr). Includes the formula and step-by-step result. Everything runs locally in your browser — nothing is uploaded.
Check if any number is prime. Also shows all factors and whether the number is odd or even. Everything runs locally in your browser — nothing is uploaded.
Calculate the GCF/GCD of two or more numbers. Shows the prime factorization method step by step. Everything runs locally in your browser — nothing is uploaded.
Generates random integers or decimals within a user-defined min-max range with optional repetition filtering. Uses the browser random number generator — fine for games, raffles, and sampling, not for security secrets. Everything runs locally in your browser — nothing is uploaded.
Step-by-step assistant for India Income Tax Return filing. ITR form selection, 80C/80D deductions, salary and house property income.
A permutation counts the number of ways to arrange k items from n items where order matters. For example, arranging 3 books on a shelf from 5 options = P(5,3) = 60 permutations.
nPr = n! / (n-k)!. The calculator shows each step: the numerator (n factorial), denominator ((n-k) factorial), and the final division result.
Yes. The tool expands the factorial terms, shows the intermediate values, and demonstrates how the division produces the final count.
Permutations count arrangements where order matters (ABC ≠ BCA). Combinations count selections where order doesn't matter (ABC = BCA). Use the Combination Calculator for selections.
Yes. All calculations run in your browser. No data is transmitted.
Combination Calculator
Calculate the number of ways to choose k items from n items (nCr). Includes the formula and step-by-step result. Everything runs locally in your browser — nothing is uploaded.
Factorial Calculator
Calculate the factorial of any number (n!). Handles large numbers and shows the full multiplication sequence. Everything runs locally in your browser — nothing is uploaded.