6 r4
6 reminder 4
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20 total marbles....7 are green
probability on first draw is 7/20...and since the marble was not replaced, the probability on the second draw is 6/19. And since they cant happen at the same time, we multiply
7/20 * 6/19 = 42/380 which reduces to 21/190
The answer is evidently <span>r(t)=t⟨1,2,3⟩</span>, where <span><span>0≤t≤1</span></span>