Guiguzi asked Sun Bin and Pang Juan questions.

Sun Bin knew that it must be the result of multiplication of two outliers. Divide all the abnormal values in 2-99 into two groups, and combine the known sum of Pang Juan, Pang Juan knows the result. For example, it is 2*5, Pang Juan gets 7, Sun Bin gets 10, and Sun Bin knows it is 2*5. From Pang Juan's point of view, 7 = 2. Because 12=2*6=3*4, there are two answers, so Pang Juan only needs to find that sum is the sum of two different numbers, and it must be the only group, and it is ok.