Question 1177089
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Regarding parts (a), (b) and (c), you should check if the sum


    P(A) + P(B) + P(C) + P(D)  is equal to  1


in each respective line.


If the sum is equal to 1 (one) in the line, the answer is "YES".


If the sum is different from 1, the answer is "NO".
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Solved, answered and explained.



Regarding part 2.2.5, do not post more than one problem in one parcel.