\(\textbf{A. Arithmetic Sequence and Series} \vspace{10 mm}\)
\(100,120,140,160,…,1000\)
\(a,a+d,a+2d,a+3d,a+4d,…,a+(n-1)d\)
\(\textbf{B. Sequence refers to the terms starting with and following a rule}\)
\(\textbf{C. Arithmetic sequence has common difference, between each consecutive term}\)
\(\textbf{D. Series is sum of the terms in the sequence}\)
\(\textbf{E. Arithmetic mean is the average of the two numbers.}\)
\(t_n=a+(n-1)d\)
\(S_n=\frac{n}{2}[2a+(n-1)d]\)
\(S_n=\frac{n}{2}[a+a+(n-1)d]\)
\(\textbf{F. Sum of natural number}\)
\(1+2+3+4+.....n=\frac{n(n+1)}{2}\)
\(\textbf{G. Arithmetic mean},b=\frac{a+b}{2}\)
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