The following bar graph shows the sales ( in thousands) of motor bikes by the factories, F1, F2, F3 and F4 in 2017, 2018 and 2019.

Which factory had the least number of sales across all the years?

F3

Total sale of F1 = 65 + 72 + 83 = 220

Total sale of F2 = 69 + 71 + 73 = 213

Total sale of F3 = 58 + 64 + 69 = 191

Total sale of F4 = 63 + 68 + 69 = 200

So , Total sale of F3 is least.