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In an arithmetic sequence, (a_2=19) and (a_8=-17). What is its explicit rule?
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Answer and explanation
Correct answer: (a_n=31-6n)
The change over six gaps is (-36), so (d=-6), hence (a_n=31-6n). From two given terms first find the common difference.
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What is the correct answer to this question?
(a_n=31-6n)
Why is this the correct answer?
The change over six gaps is (-36), so (d=-6), hence (a_n=31-6n). From two given terms first find the common difference.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Explicit or general rule.
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