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MC-IV wk 2 problem 7

 
 
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MC-IV wk 2 problem 7
ChenWilliam - 2018年06月26日 Tuesday 21:36
 

Is there an error in the problem? There is no possible integer value for $a_3$ because $\frac{a_2 ^ 2}{a_1}$ is equal to 24.5, and no positive integer is less than 0.5 from 24.5.