B) 3n
well, first of all, you can try it out with numbers like 4,6,28...
3(4)
=12
3(6)
=18
3(28)
=84
also, you can disprove the other theories
a) 0+3=3 (odd)
b) 4^2-1=15 (odd)
P(3) = 1/6
P(odd) = 3/6 = 1/2 ........(odd = 1,3,5)
P(less than 5) = 4/6 = 2/3.....(less than 5: 1,2,3,4)
P(prime) = 3/6 = 1/2 ..........(prime: 2,3,5)
P(4 or 6) = 2/6 = 1/3
P(not 1) = 5/6 .....................(not 1: 2,3,4,5,6)
hope it helps
Answer:

Step-by-step explanation:
<u>Step 1: Set x to 3
</u>
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Answer: 
I do not know what you mean by in proof but are there multiple choice answers?