Question
What are the missing numbers?
6166, (a)          , 6266, 6316, (b)          , 6416
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?
6166, (a)          , 6266, 6316, (b)          , 6416