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## geerky42 2 years ago Using the following array, determine the value of the mean of the 19th row.

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1. geerky42

|dw:1364052369205:dw|

2. ParthKohli

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

Smart approach. Thanks!

4. ParthKohli

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

But that's long work, so I have another pattern recognition thingy.

6. ParthKohli

Never mind, just use that one.

7. geerky42

That's fine, I can handle it. I got 362. Am I correct?

8. geerky42

I didn't add 39.

9. ParthKohli

No, you're right lol

10. geerky42

Oh ok. Just making sure. Thanks!

11. RadEn

|dw:1364053086567:dw|

12. ParthKohli

Oh yeah, sum of an arithmetic sequence :-)

13. RadEn

yup :)

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