Question

4+9+14+19+...+494
What is the arithmetic sequence answer

Answer 1

Explanation:

4+9+14+...+494

d=9-4=5

\[a_{n}=a_{1}+(n-1)d\]
`494=4+(n-1)5\\490=(n-1)5\\n-1=98\\n=98+1=99\\S_(n)=(99)/(2) (4+494)\\=99*(498)/(2) \\=99*249\\=24,651`