Answer:
You need to find a pattern in order to solve (check explanation)
Explanation:
The easiest way to find a pattern is by knowing the difference between two numbers; in this case, it's 3 and 6 (a-numerators), 3 - 6 = 3 we know you could get this by multiplying 3 x 2
Now that you know this-- the other a-numerators are products of 3
A) 3, 6 , 9 , 12 , 15, 18
20
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I'm not so sure as for the b problem, I genuinely don't want to give a bad answer, but possibly using the same tactic could work, it does seem like the denominator is more important for b.