Question
What are the missing numbers?
1507, 3217, (a) _____, 3251, (b) _____, 3285
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?
1507, 3217, (a) _____, 3251, (b) _____, 3285