Question

17th term of an arithmetic sequence is 23 and 23rd term is 17 find the first time and common differenc

Answer 1

Answer:

Calculate the sum of the first 20 terms of the arithmetic sequence whose formula for the nth term is: un=1+(n−1)×4.

Calculate the sum of the first 30 terms of the arithmetic sequence defined by the formula: un=4+(n−1)×(−3)

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation: