The Chance of Two Different Files Having the Same MD5

The chance of two different files having the same MD5 value is roughly one in 340 billion billion billion billion which is approximately equivalent to winning 30,000 billion billion billion first prizes in the Hong Kong Mark Six - the lotto game in Hong Kong which randomly picks 6 numbers from 1 to 47 with a one in 10,737,573 chance of winning first prize.