Mrs. watson's jar of beads contains 100 red beads, 50 blue beads, and 50 green beads. if she pulls out a bead without looking, what is she chance that the bead will be blue?
25%, or 33%, or 50%?

Use stokes' theorem to evaluate c f · dr where c is oriented counterclockwise as viewed from above. f(x, y, z) = xyi + 5zj + 7yk, c is the curve of intersection of the plane x + z = 8 and the cylinder x2 + y2 = 81.