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Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

When the ball has traveled a distance of

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex