Both are 1/4. The first person: the possibility of "1" in the four numbers is 1/4. Second person: The probability that the first person didn't catch "1" is 3/4. On the premise that the first person didn't catch "1", the second person caught "1" from the three, and the probability was 3/4* 1/3= 1/4. Third person: The first person didn't catch "1" with a probability of 3. The probability that the second person fails to catch "1" is 2/3; On the premise that the first and second people didn't catch "1", the third person caught "1" in the remaining two numbers with a probability of 3/4*2/3* 1/2. The fourth person: The first person failed to catch "1" with a probability of 3/4. The probability that the second person fails to catch "1" is 2/3; The probability that the third person didn't catch "1" is 1/2, and the fourth person has only one number left, so the probability of "1" is 3/4*2/3* 1/2= 1/4.