What is the name of the book/story where a boy goes to a planet and is offered the choice of many weapons but chooses a knife.
I read it when I was in secondary school in the seventies.
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It's Tunnel In the Sky by Robert A Heinlein. The hero has a conversation with his (much more experienced) sister near the beginning of the book where she advises him to take a knife and not a gun on his advanced survival test (which is on a different planet).
To quote from the linked Wikipedia article:
Rod, acting on his older sister's advice, takes hunting knives and basic survival gear rather than high-tech weaponry, on the grounds that the latter could make him over-confident.