Question
What are the missing numbers?
3507, (a)          , 3607, 3657, (b)          , 3757
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?
3507, (a)          , 3607, 3657, (b)          , 3757