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maths magic

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There are A,B,C,D at one end of the bridge.they have to cross within 17 minutes.only 2 can cross the bridge at atime .since it is very dark one has to come back to show the light and its said that A can cross the bridge in 1 min ,B can cross at 3min ,C in 5 min and D in 10 min.How and at What time will they cross the bridge

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