Second floor: 6 points,
Third floor: 12 points,
Fourth floor: 18 points,
……
N layer: 6(n- 1) point (n >；; 1)
A *** 100 layer, the last layer has 6×99 points.
1+6+ 12+ 18+……+6×99
= 1+(6+6×99)×99÷2
= 1+6×( 1+99)×99÷2
= 1+3× 100×99
= 1+29700
=2970 1 (pieces)
A * * * has 2970 1 minute.
Hope to adopt, thank you!