Question
Complete the number pattern.

50, 60, 160, 170, 270, 280, 380, (a)       , 490, (b)       
2 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.

50, 60, 160, 170, 270, 280, 380, (a)       , 490, (b)