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Bunuel
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The total number of arrangements = 5! = 120
Options tell you that you are looking at the last few orders.
Last Arrangement will be : USOMA
List from 120th Position:
USOMA - 120
USOAM - 119
USMOA - 118
USMAO - 117
USAOM - 116
USAMO - 115
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Total number of arrangements of AMOSU = 5! = 120. Scanning through the options (112 to 116), I quickly realize that US*** set should be the last set of arrangement.

The number of arrangements in US*** set = 1*1*3*2*1 = 6, spanning from #115 to #120. Just as US AMO is at the beginning of this last set, so it certainly occupies position no 115.

Final answer is (D)
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