Permutation and Combination

Factorials - Find 'n' if (16 - n)! / (14 - n)! = 12

Find 'n' if (16 - n)! / (14 - n)! = 12. A solved example in Factorials in Permutations and Combinations

Factorials - Prove [15! / (5! x 10!)] + [15! / (4! x 11!)] = 16! / (5! x 11!)

Question: Prove [15! / (5! x 10!)] + [15! / (4! x 11!)] = 16! / (5! x 11!) . An example on Factorials in Permutation and Combinations

Factorials - Simplify [4 (45!) + 46!] / [150 (44!)]

Question: Simplify [4 (45!) + 46!] / [150 (44!)] - An example on Factorials from Permutation and Combinations

How many numbers of 4 different digits can be formed using the digits 0, 1, 2, 3, 4, 5 ?