Q. Find the 84 th term of the arithmetic sequence 23,39,55,…Answer:
Identify Common Difference: Identify the common difference of the arithmetic sequence.To find the common difference, subtract the first term from the second term.39−23=16Common Difference: 16
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, d is the common difference, and n is the term number.
Calculate 84th Term: Calculate the 84th term using the formula.a1=23 (first term)d=16 (common difference)n=84 (term number)a84=23+(84−1)×16
Perform Calculation: Perform the calculation.a84=23+(83×16)a84=23+1328a84=1351