BMAD Posted October 21, 2013 Report Share Posted October 21, 2013 In drawing lowercase English letters a through z uniformly at random, the expected time till you see willywilly is 26^10 + 26^5. In drawing numerals over 0-9 uniformly at random, the expected time till you see 1231231 is 10^7 + 10^4 + 10. In flipping a fair coin, the expected time till you see HTHTTHT is 2^7 + 2^2. See a pattern? Find it ... then prove it. Quote Link to comment Share on other sites More sharing options...
0 ThunderCloud Posted October 21, 2013 Report Share Posted October 21, 2013 I may be missing something obvious, but why is the expected time to see "willywilly" not 26^10? Quote Link to comment Share on other sites More sharing options...
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