Question
What are the missing numbers?
4413, 4433, (a)         , 4473, (b)         , 4513
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?
4413, 4433, (a)         , 4473, (b)         , 4513