Question
512 x 12 + 116 x 12 + 513 x 12
= (a)            x 12
= (b)           
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

512 x 12 + 116 x 12 + 513 x 12
= (a)            x 12
= (b)