pyramid, sacred summator

[latinanurse]

Can someone help me with the 2nd puzzle? How can I have black,white,black,when I can only change the last row of beads?::confused:

[woodlandpearl]

I believe that I had to put one "column" vertical on the lower row (I think it was black white black because there was no other column that I could create with that combo). So I would create the other three columns and I believe that the black white black combo was somewhere in around the middle or so of the bottom column.