Question: 100 Twitter users were required to submit their ID, submit their birth certificate, or both. 40 users submitted their ID and 12 users submitted both

100 Twitter users were required to submit their ID, submit their birth certificate, or both. 40 users submitted their ID and 12 users submitted both their ID and birth certificates. If it is known that a user gave their ID, what is the probability that this user gave their birth certificate as well

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