You made two errors.

32 hexadecimal digits is 1632 numbers. MD5 hashes are 128 bits in size. 16 hex digits are used to represent the hash since 1632 is equal to 2128.

The chances of a collision cannot be ascertained since you haven't shown that every hash is equally likely to be generated.

In reply to Re^5: Assistance with file compare by ikegami
in thread Assistance with file compare by Karger78

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