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猜珠子有黑、红、白三种颜色的珠子共280颗,按5黑4红3白排列,第158颗珠子是什么颜色?第158颗珠子前面共有黑珠子多少颗?
Guess the beads are black, red and white beads of three colors a total of 280, according to 5 black 4 red 3 white arrangement, the 158th bead is what color? The first 158 beads in total black beads how many?