Posted by **Paisley** on Sunday, January 5, 2014 at 9:18pm.

Help me solve this input output table?

1 1

2 3

3 6

4 10

5 15

6 21

So what equation should I do to get from the number in the first column to the number in the second column?

- Math -
**Reiny**, Sunday, January 5, 2014 at 10:29pm
I usually "play aroung" with the y values, I found this ....

suppose we double all y values

1 2 = 1x2

2 6 = 2x3

3 12 = 3x4

4 20 = 4x5

5 30 = 5x6

6 42 = 6x7

...

n ----> n(n+1)

Did you see the pattern ?

but remember we multiplied by 2

so, .....

y = x(x+1)/2

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