Easy
Complete the recursive formula of the arithmetic sequence −15,−11,−7,−3,…-15,-11,-7,-3, \ldots−15,−11,−7,−3,….
c(n)=c(n−1)+4c(n)=c(n-1)+4c(n)=c(n−1)+4
c(n)=c(n−1)−4c(n)=c(n-1)-4c(n)=c(n−1)−4
c(n)=c(n−1)+2c(n)=c(n-1)+2c(n)=c(n−1)+2
c(n)=c(n−1)−2c(n)=c(n-1)-2c(n)=c(n−1)−2
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