Three humans, one big wolf and two small wolves are to cross a river:......Can you tell us how they can cross the river?

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Three humans, one big wolf and two small wolves are to cross a river:

These are the conditions that have to be followed.

1. Only humans and the big wolf can row the boat.
2. At all times, the number of humans on either side of the river must be greater or equal to the number of wolves on that side. (Or else the humans will be eaten by the wolves!)
3. The boat only has room for 2 (wolves or humans).
4. wolves can jump out of the boat when it’s banked.

Can you tell us how they can cross the river?

posted Aug 11, 2017

Let H represent Humans;

Let W represent Adult Wolves &

W represents small wolves.

The three columns represent the left bank of the river, the boat, and the right bank respectively. The < and > indicates the direction of motion of the boat.

Initial: HHHWww . .

HHHw Ww> .

HHHw <W w

HHH Ww> w

HHH <W ww

HW HH> ww

HW <Hw Hw

Hw HW> Hw

Hw <Hw HW

ww HH> HW

ww <W HHH

w Ww> HHH

w <W HHHw

. Ww> HHHw

. . HHHWww
(Bhavinionline.com)

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