Question
What are the missing numbers?
5176, 5206, (a)         , 5266, (b)         , 5326
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?
5176, 5206, (a)         , 5266, (b)         , 5326