Answer:
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24/13 or 1.8
Step-by-step explanation:
27b -3 - 14b -21 = 0
13b - 24 = 0
13b = 24
b = 24/13 or 1.8
It's arithmetic
For n=0 you got 4
For n=1 you got 4-1/6
For the next element the value will be the current element minus 1/6