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Question

The following line graph shows the population of rabbits in subsequent years:

For how many years has the population of rabbits increased at a fixed rate?

A
One
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B
Two
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C
Three
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D
Four
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Solution

The correct option is D Four
The tabular representation of the given data set is: Year Population
2015 3
2016 5
2017 6
2018 7
2019 8
2020 9

Increase of population in the respective years: Year Interval Increase in Population
2015 - 2016 5 - 3 = 2
2016 - 2017 6 - 5 = 1
2017 - 2018 7 - 6 = 1
2018 - 2019 8 - 7 = 1
2019 - 2020 9 - 8 = 1

Hence, for four years, i.e., 20162017,20172018,20182019and20192020, the rate of increase of population is 1 rabbit per year.

Hence, four years is the required answer.

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