Question
Complete the number pattern.

30, 60, 360, 390, 690, 720, 1020, (a)        , (b)        , 1380
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

Complete the number pattern.

30, 60, 360, 390, 690, 720, 1020, (a)        , (b)        , 1380