Question
Fill in the blanks.
164, 168, 172, 176, 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.
164, 168, 172, 176, 180, (a) _____ , (b)  _____