Study the bar chart and answer the questions.
Sale of Cellular Phones
1. |
The difference in the sales of cellular phones for the years 1997 and 1999 is ? |
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2. |
The two years between which the rate of change of cellular phones is minimum are ? |
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3. |
The sum of sales of cellular phones in the years 1999 and 2001 is equal to that in ? |
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