packs of shirts

Atwood's machine ] bag of marbles ] balance moon stone ] ball up/down ] bead parabola accelerometer ] boat anchor lake ] boat time ] bobbin on incline ] bosun's chair ] bouncing ball ] bowling ball rolling ] bug on band ] bursting shell ] falling chain ] Feynman's restaurant problem ] five pills ] flying cable ] forced pendulum ] gold mountain ] half pills ] hallway pole ] impelled rod ] inelastic relativistic collision ] infinite pulleys ] mass on an incline ] maximum angle of deflection ] [ packs of shirts ] particle in bowl ] particle in cone ] particle on sphere ] particle points parabola ] pile of bricks ] pion muon neutrino ] piston ramp spring ] plank weight trough ] rocket vs. jet ] roll without slipping ] rough inclined plane ] shooting marbles ] speedometer test ] three balls ] three logs ] turntable cart ] two rolling balls ] wheel and block ] whirling pendulum ] worlds fair ornament ]

This fun exercise comes from "Problems and Recreations," by Ralph E. Winger, Ralph Leighton's great-uncle (after whom he was named). Winger was a graduate of Caltech, and Robert Leighton's  physics teacher at Los Angeles City College.

A wholesaler sells six patterns of shirts, and packs them in boxes each containing six shirts. Since his customers have different demands for different patterns, the jobber wishes to pack boxes in advance, so that he can pull any kind of pack the retailer desires off the shelf. How many different packs must he prepare?

Answer :

Solutions (listed by author)

Michael A. Gottlieb (nb, 3k)

Keith Wald (html, 4k)


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