Exercise 17.91. 1/32. a 1/6 b 1/3 c 1/2 d 03. a 1/6 b (i) 1/6 (ii) 1/2 (iii) 0 (iv) 1/64. a 1/4 b 1/3 c 5/12 d 1/25. a 1/5 b 7/10 c 1/10 d 9/106. a 1/3 b 2/9 c 1/6 d 1/9 e 1/12 f 1/18 g 1/36 h 7/18 i 11/187. a 5/11 b 2/11 c 5/11 d 6/118 4/79. a HHH, HHT, HTH, THH, TTT, TTH, THT, HTT b (i) 1/8 (ii) 1/810. a 1/20 b 2/5 c d 2/511. 3 12. 075 13. Boys 36, Girls 24.14. a b c 1/13 d 1/52 e 3/1315. a 1/18 b 1/6 c 1/36 d 5/12