Question
What are the missing digits? 
  1. X
  2. Y
  7 X 4 3
-    2 7 Y
  7 0 7 1 


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 digits? 
  1. X
  2. Y
  7 X 4 3
-    2 7 Y
  7 0 7 1