Since 1/2 is distributed over 1/3 and 1/4 hence the law applied is the distribution law of addition.
Distribution law
Given the following integers A, B and C. According to the distribution law;
A(B + C) = AB + AC
This shows that the value A is distributed over B and C
Given the expression
1/2 + (1/3*1/4) = (1/2*1/3) + (1/2*1/4)
From the result, you can see that 1/2 is distributed over 1/3 and 1/4 showing that the law applied is the distribution law of addition
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