Q. Find the 75th term of the arithmetic sequence 13,33,53,…Answer:
Identify common difference: Identify the common difference in the arithmetic sequence.The sequence is 13,33,53,… where each term increases by 20.Common difference (d)=33−13=20
Use formula for nth term: Use the formula for the nth term of an arithmetic sequence.The nth term an of an arithmetic sequence is given by an=a1+(n−1)d, where a1 is the first term and d is the common difference.
Substitute values for 75th term: Substitute the values into the formula to find the 75th term.a1=13 (the first term)n=75 (since we are looking for the 75th term)d=20 (the common difference)a75=13+(75−1)×20
Perform calculations: Perform the calculations.a75=13+(74×20)a75=13+1480a75=1493