List all the combinations of four objects x, y, z, and s taken three at a time. What is 4C3?
A. xxx, xxy, xxz, xxs, xyy, xyz, xys, xzz, xzs, xss, xsy, xsz, xss, yyy, yyz, yys, yzz, yzs, yss, zzz, zzs, zss, sss
B. xyz, xys, xzs, yzs
C. x, y, z, s
D. xyz, xys, xzy, xzs, xsy, xsz, yxz, yxs, yzx, yzs, ysx, ysz, zxy, zxs, zyx, zys, zsx, zsy, sxy, syz, szx, szy
What is 4C3?
(Simplify your answer.)
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