Q. Find the 65th term of the arithmetic sequence −26,−11,4,…Answer:
Use Formula: To find the 65th term of an arithmetic sequence, we need to use the formula for the nth term of an arithmetic sequence, which is:an=a1+(n−1)dwhere an is the nth term, a1 is the first term, n is the term number, and d is the common difference between the terms.
Identify First Term: First, we identify the first term a1 of the sequence, which is given as −26.
Find Common Difference: Next, we need to find the common difference d. We can do this by subtracting the first term from the second term: d=−11−(−26)=−11+26=15
Calculate 65th Term: Now that we have the first term and the common difference, we can find the 65th term (a65) using the formula:$a_{\(65\)} = a_1 + (\(65\) - \(1\))d
Substitute Values: Substitute the known values into the formula: \(a_{65} = -26 + (65 - 1) \times 15\)