Question
Complete the number pattern. Fill in the missing number.
1245, 1252, (a)           , 1266, 1273, (b)           
1 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

Complete the number pattern. Fill in the missing number.
1245, 1252, (a)           , 1266, 1273, (b)