Ok

I have data like this:

A B A B A B A B
1 10 2 20 3 30 4 ?

The trend formula is =trend (known y, [known x],new x)

Generally we select the known y values which are in continuous cells, and
then select known x values, after which for a new x value €“ y-values could be
estimated.

But is there any way that this could be done by selecting y and x €“ values
which are in non-contiguous cells( like values if present in alternative
cells)

Is there a way to program:
1.Collect all the values present in alternate cells starting from say A2 (
these are my y-values)
2. Next collect all the values present in alternate cells starting from say
A3 (these will be x values)
3. Now can I use the trend function for forecasting??

Is this a way possible..