Find the first 5 terms of the sequence: an = 4n-1.
#sol1a1=1×4-1=3a2=2×4-1=7a3=3×4-1=11a4=4×4-1=15a5=5×5-1=19 #sol2f(1)=1×4-1=3,f(n+1)=f(n)+4,so .... you know.