Q. Complete the recursive formula of the geometric sequence27,−9,3,−1,…. b(1)=□b(n)=b(n−1)⋅□
Identify Pattern: We have the sequence: 27,−9,3,−1,…To find the recursive formula, we need to determine the pattern between consecutive terms.
First Term Given: The first term is given as b(1)=27.
Calculate Common Ratio: To find the common ratio r, we divide the second term by the first term: r=(−9)/27=−1/3.
Write Recursive Formula: Now that we have the common ratio, we can write the recursive formula. The recursive formula for a geometric sequence is b(n)=b(n−1)×r.
Substitute Common Ratio: Substitute the common ratio (−31) into the recursive formula: b(n)=b(n−1)×(−31).
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