• nikolalam
    1
    Can anybody help me? I can't fix the question no.13 and 15 in the picture. One of the requirements in solving Question 15 is that you cannot using the distribution rule in you nature deduction. Also, no matter whether I use the cp rule or ip rule to start solving question 13, I always get stuck at the same step:

    160114_06dfbf4d969ba6ee77dd5c2664fd18af.jpg
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