@Tiffany_Tasa2 to answer your implicit question for others who may come upon this post...
With a trigger SC, Marketo applies the Random Sample to every campaign run regardless of lead. It doesn't "remember" what the same Lead ID did the last time it ran.
So with a Random Sample = 50 and 2 choices, and the SC qualification rules set to "Every time", the same lead can qualify for either choice an unlimited number of times.
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