The recurrence relation is defined as
\(A_n = A_{n-1}+n\)
Hence,
\(A_{n+1} = A_n + n+ 1\)
\(\Rightarrow A_n = A_{n+1} -n -1\)
Option D.
\(A_n = A_{n-1}+n\)
Hence,
\(A_{n+1} = A_n + n+ 1\)
\(\Rightarrow A_n = A_{n+1} -n -1\)
Option D.
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