Question
What are the missing digits?
  1. X
  2. Y
   7 Y 7 4
+    3 X 5
   8 2 4 9

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 Y 7 4
+    3 X 5
   8 2 4 9