Master Wang has produced nine ping-pong balls of the same size, and 1 of them are inferior in quality. Can you find out the inferior products twice with a balance?

it's no difficulty. .

Divide into 3 piles, 3 piles for the first time, and choose 2 piles. If the weight is different, take the lighter pile. If the weight is the same, take the third pile. Put 2 piles just taken out on the end of the balance for the second time, and weigh the lighter one as defective. If the weight is the same, one inside and one outside is defective.

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