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This function checks if a given number passes the Luhn algorithm. It is commonly used to validate credit card numbers.
checkLuhn(number)
A logical value indicating whether the number passes the Luhn algorithm (TRUE) or not (FALSE).
A character string of the number to check against the Luhn algorithm.
checkLuhn("4532015112830366") # TRUE checkLuhn("4532015112830367") # FALSE
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