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A database system assigns a32 -character ID to each record, where each character is either a number from0 to9 or a letter fromA toF .

A database system assigns a32

-character ID to each record, where each character is either a number from0

to9

or a letter fromA

toF

. Assume that each number or letter being selected is equally likely. Find the probability that at least20

characters in the ID are numbers. Use Excel to find the probability.

Round your answerto three decimal places.

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