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Bablu Dubey

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can you explain P(C2) and P(C3) how it came 1/5 and 4/5 respectively...???

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The Sinking Island

first A and B go to the mainland in 2 minutes and B returns back in 2 minutes,then C and D go to the mainland in 10 minutes and A returns back in 1 minutes and in the last A and B go to the mainland in 2 minutes. Hence Ans Will be:2+2+10+1+2=17

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