Answer:
Part A: 0,2,6,12,20,30 [pattern is (x, x-1) ] Part B: 90
Step-by-step explanation:
Part A
1x0=0
2x1=2
3x2=6
4x3=12
5x4=20
6x5=30
Part B
(x,x-1)
(10,10-1)
10 x 9=90