Box 1 contains three cards bearing numbers 1, 2, 3; box 2 contains five cards bearing numbers 1, 2, 3,4, 5; and box 3 contains seven cards bearing numbers 1, 2, 3, 4, 5, 6, 7. A card is drawn from each of the boxes. Let $x_i$ be the number on the card drawn from the ith box, i = 1, 2, 3.The probability that $x_1+x_2+x_3$ is odd isThe probability that $x_1,x_2,x_3$ are in an aritmetic progression is

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