Hello,
A: is an arithmetic sequence: f(n)=3+(n-1)*4
B: is a Fibbonacci's sequence f(n+2)=f(n+1)+f(n), f(1)=4,f(2)=6
C: is a geometric sequence :first term =4 ratio=4
f(n)=4*4^(n-1)=4^n
21c squared-40
that's your answer.
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