math

A man selling fruit has only three weights. But with them he can weigh any whole number of kilograms (from 1 kg to 13 kg) inclusive on his balance.

What weights does he have?

I can't figure this out

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1. The man had 1kg, 3kg and 9 kg weights.

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posted by Kalyan
2. what is the weiight of a semi trailer

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3. How did you get this answer?

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