Question
What are the missing numbers?
1500, (a) _____ , 1540, 1560, (b) _____ , 1600
1 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?
1500, (a) _____ , 1540, 1560, (b) _____ , 1600