Question
What are the missing numbers?
7811, (a)          , 7871, 7901, (b)          , 7961
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?
7811, (a)          , 7871, 7901, (b)          , 7961