9) The ratio of the number of Sam's CDs to the number of Alice's CD's is 7 to 8. Sam has 84 CDs. Together how many CDs do they have?

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A: We have to find the LCM of 77 and 18.

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A: Given:              C87, 1 The number of k-combinations from a given set S of n elements can be…

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Cylinders

A cylinder is a three-dimensional solid shape with two parallel and congruent circular bases, joined by a curved surface at a fixed distance. A cylinder has an infinite curvilinear surface.

Cones

A cone is a three-dimensional solid shape having a flat base and a pointed edge at the top. The flat base of the cone tapers smoothly to form the pointed edge known as the apex. The flat base of the cone can either be circular or elliptical. A cone is drawn by joining the apex to all points on the base, using segments, lines, or half-lines, provided that the apex and the base both are in different planes.