Find the formula of the n-th term of an arithmetic progression
In the arithmetic progression (
a term of this progression? If yes, find its number.
Find the initial term of the arithmetic sequence (
What is the number of the first positive term of an arithmetic sequence (
Find the first negative term of an arithmetic sequence (
Find the fourth term of an arithmetic progression (
The formula of an arithmetic progression (
) is . Find the sum of the first twenty terms of this progression.
Find the sum of first fifteen terms of an arithmetic sequence (
How many times (
) a clock would stroke during a day if it strokes only integer amount of hours from
Find the sum of all two-digit numbers that are multiples of