# Combinations

From Why start at x, y, z

The letter \(C\) is sometimes used to represent the binomial coefficient.

Is it \(_nC_r\) or \(^nC_r\)?^{[1]}

Please add examples of each notation. Calculators normally have one.

From Why start at x, y, z

The letter \(C\) is sometimes used to represent the binomial coefficient.

Is it \(_nC_r\) or \(^nC_r\)?^{[1]}

Please add examples of each notation. Calculators normally have one.

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