Q. Find the 50 th term of the arithmetic sequence −30,−26,−22,…Answer:
Use Formula: To find the 50th term of an arithmetic sequence, we need to use the formula for the nth term of an arithmetic sequence, which is given by: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. From the given sequence (−30, −26, −22, ...), the first term a1 is −30.
Determine Common Difference: Next, we determine the common difference d by subtracting the first term from the second term: d=−26−(−30)=−26+30=4.
Find 50th Term: Now that we have the first term and the common difference, we can find the 50th term a50 using the formula:a50=a1+(50−1)da50=−30+(50−1)×4
Perform Calculation: We perform the calculation inside the parentheses first:50−1=49
Multiply and Add: Next, we multiply 49 by the common difference 4:49×4=196
Multiply and Add: Next, we multiply 49 by the common difference 4:49×4=196Finally, we add this result to the first term to find the 50th term:a50=−30+196a50=166
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