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geerky42

  • one year ago

Using the following array, determine the value of the mean of the 19th row.

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  1. geerky42
    • one year ago
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    |dw:1364052369205:dw|

  2. ParthKohli
    • one year ago
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    Just pattern recognition... The mean of the 1st line is \(2\). The mean of the 2nd line is \(5\). The mean of the 3rd line is \(10\). The mean of the 4th line is \(17\). You're just adding 3, then adding 5, then adding 7, then adding 9... and so on

  3. geerky42
    • one year ago
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    Smart approach. Thanks!

  4. ParthKohli
    • one year ago
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    You can figure out the mean of the 5th line by adding 9, then the mean of the 6th line by adding 11... You're welcome!

  5. ParthKohli
    • one year ago
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    But that's long work, so I have another pattern recognition thingy.

  6. ParthKohli
    • one year ago
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    Never mind, just use that one.

  7. geerky42
    • one year ago
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    That's fine, I can handle it. I got 362. Am I correct?

  8. geerky42
    • one year ago
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    I didn't add 39.

  9. ParthKohli
    • one year ago
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    No, you're right lol

  10. geerky42
    • one year ago
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    Oh ok. Just making sure. Thanks!

  11. RadEn
    • one year ago
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    |dw:1364053086567:dw|

  12. ParthKohli
    • one year ago
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    Oh yeah, sum of an arithmetic sequence :-)

  13. RadEn
    • one year ago
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    yup :)

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