aftyn behn results

bilibili2009626B QuestMobile 2017 Q2 B24.
BB
Win10 bilibili bilibili Windows b 7,531
b (_)!!.
B bilibiliBB.
1 2 3
1TV 2WiFi 3.
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4.UPUP UP .

bilibili2009626B QuestMobile 2017 Q2 B24.
BB
Win10 bilibili bilibili Windows b 7,531
b (_)!!.
B bilibiliBB.
1 2 3
1TV 2WiFi 3.
100%
4.UPUP UP .
Re-express: perhaps the problem assumes exact arithmetic.
But 1200 is likely a typo or accept the quadratic solution.
However, in real exams, such models expect algebraic solution even if not integer.
But terms must be integer. So likely, the sum is meant to be achieved.
But in exact math, no integer solution.
But problem says is 1,200, so perhaps accept the equation and find positive root.
But number of terms must be integer.
Alternatively, perhaps the sequence is defined to have exact sum.
But given the format, likely expects solving the quadratic and taking ceiling or floor.
However, in standard problems, such sums are structured to be exact.