There are red, yellow, black, white each a four color ball, placed in a numbered 1, 2, 3, 4 four boxes, each box placed a ball, I do not know their order. A, b, c three speculation to place order as follows: a: black ball in the box, 1 yellow ball in the box 2, B: black ball in the box, 2 white balls in the box 3, C: the red ball in the box, 2 white balls in the box 4. Results show that a, b, c three people guessed the half, each given four color ball placed in the box.

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