River Crossing Puzzle

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River Crossing Puzzle

There is an Island of puzzles called puzzles-world where numbers 1 - 9 want to cross a river.
There is a single boat that can take numbers from one side to the other.
However, maximum 3 numbers can go at a time and of course,
the boat cannot sail on its own so one number must come back after reaching to another side.
Also, the sum of numbers crossing at a time must be a square number.
You need to plan trips such that minimum trips are needed.

How many minimum trips are needed ?

Other River Crossing Puzzles :
Farmer Wolf Goat River Crossing
River Crossing Puzzle

Click here for Answer

The minimum Trips required are 7.

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