Question
Complete the number pattern. Fill in the missing number.
1863, (a)          , 1873, 1878, (b)           , 1888
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.
1863, (a)          , 1873, 1878, (b)           , 1888