id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajrhss-2193	Abdurashitov Rakhmatullo Abdukhamitovich; Khusenov Zikrillo Raxmatillo ogli; Adkhamov Khasanboy Abdusalom ogli	ARITHMETIC PROGRESSION	2024	3	.pdf	application/pdf	1051	63	67	The sum of the first \( n \) terms (\( S_n \)) can be calculated using \( S_n = \frac{n}{2} (2a + (n-1)d) \) or \( S_n = \frac{n}{2} (a + l) \), where \( l \) is the last term. The \( n \)th term (\( T_n \)) of an arithmetic progression is given by:\[ T_n = a + (n - 1)d \] Sum of the First n Terms The sum of the first \( n \) terms (\( S_n \)) of an arithmetic progression is: Sn = \frac{n}{2} (2a + (n - 1)d)or equivalently, Sn = \frac{n}{2} (a + l) where \( l \) is the last term of the sequence.	cache/ajrhss-2193.pdf	txt/ajrhss-2193.txt