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The number of antelope in a certain herd increases every year by a constant factor. If there are 500 antelope in the herd today, how many years will it take for the number of antelope to double?
(1) Ten years from now, there will be more than ten times the current number of antelope in the herd.
(2) If the herd were to grow in number at twice its current rate, there would be 980 antelope in the group in two years.
In the original condition, the number of different animals in the herd, the number of antelopes after the herd doubled, constant factor that increases every year are all variables. Thus we need 3 equations to match the 3 variables. Since there are 1 equations each in (1) and (2), E is likely the answer. In actual calculation, even if we use both (1) &(2) we can't find out the constant factor as it states that the number is ten times higher after ten years, and in (2) we can't find out the number of the antelopes when the herd is doubled. Therefore the answer is E.
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