Recall how we use the red triangle to figure out how this bee hive grows? 1 + 6 + 12 + 18 + 24 + ... Each layer has 6 more hexagons than the inner layer because the triangle base grows as 1, 2, 3, 4...
Now can you solve these two questions using a similar approach?
1) D
2) B
3) C
#1=B