# Binomial Theorem, Factorial, Permutations, Combination and Probability Tricks and Formulas

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## Binomial Theorem

If *n* is a natural number that is greater than or equal to 2, then according to the binomial theorem:

Here,

## Factorial

## Permutations

## Combinations

Important Properties

## Partition Rule

Number of ways of distributing n identical things among r persons when each person may get any number of things