Question
Fill in the blanks.
168, 171, 174, 177, 180, (a) _____ , (b)  _____
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

Fill in the blanks.
168, 171, 174, 177, 180, (a) _____ , (b)  _____