12, 15, 20, 27 เดเดจเตเดจเต เดธเดเดเตเดฏเดเตพ เดเตเดฃเตเดเต เดจเดฟเดถเตเดถเตเดทเด เดนเดฐเดฟเดเตเดเดพเดตเตเดจเตเดจ เดเดฑเตเดฑเดตเตเด เดเตเดฑเดฟเดฏ เดเดฃเตเดฃเตฝเดธเดเดเตเดฏ เดเดคเต?
A540
B630
C560
D420
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