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Adam1994

  • 4 years ago

What is the 9th term of this arithmetic sequence? 2a - b, a, b, .....

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  1. TuringTest
    • 4 years ago
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    let's find the common difference between each term I guess...

  2. TuringTest
    • 4 years ago
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    the common difference is d=a-(2a-b)=b-a so we have up to the third term b 4th term b+(b-a)=2b-a 5th term 2b-a+(b-a)=3b-2a with the common difference you should be able to figure out what the nth term is. if not, just do it manually ;)

  3. Adam1994
    • 4 years ago
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    Thanks!!

  4. TuringTest
    • 4 years ago
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    welcome :)

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