Q. Find the 66th term of the arithmetic sequence −27,−41,−55,…Answer:
Identify common difference: Identify the common difference in the arithmetic sequence.The common difference d is the difference between any two consecutive terms. We can find it by subtracting the first term from the second term.d=−41−(−27)=−41+27=−14
Use formula for nth term: Use the formula for the nth term of an arithmetic sequence.The nth term an of an arithmetic sequence can be found using the formula:an=a1+(n−1)dwhere a1 is the first term, n is the term number, and d is the common difference.
Plug values for 66th term: Plug the values into the formula to find the 66th term.a1=−27 (the first term)n=66 (the term number we want to find)d=−14 (the common difference found in Step 1)Now, calculate the 66th term using the formula:a66=−27+(66−1)(−14)
Perform calculations: Perform the calculations.a66=−27+(65)(−14)a66=−27−910a66=−937