Q. Find the 100 th term of the arithmetic sequence 18,31,44,…Answer:
Identify Common Difference: Identify the common difference in the arithmetic sequence.To find the common difference, subtract the first term from the second term.31−18=13Common Difference: 13
Use Formula for nth Term: Use the formula for the nth term of an arithmetic sequence.The formula is an=a1+(n−1)d, where an is the nth term, a1 is the first term, n is the term number, and d is the common difference.
Substitute Values: Substitute the known values into the formula to find the 100th term.a100=18+(100−1)×13
Perform Calculations: Perform the calculations.a100=18+(99×13)a100=18+1287a100=1305