Question
What are the missing numbers?
8530, 8560, (a)         , 8620, (b)         , 8680
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

What are the missing numbers?
8530, 8560, (a)         , 8620, (b)         , 8680