22
10-2=8,8-1=7,7x2=14,14+1=15,15-2=13,13-1=12,12x2=24,24+1=25,25-2=23 which conclude that strting with -2,-1,x2,+1,-2,-1,x2,+1,-2, now it is -1, therfore the required digit is 23-1=22
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10 7 11 12 9 13 14 11 15 16 13 17 18 15 19 20...
8,9,10,1112,13,14,15 Answer for 15,8,14,9,13,10,12,11
15*14*13*12 = 32,76015*14*13*12 = 32,76015*14*13*12 = 32,76015*14*13*12 = 32,760
10 = A 11 = B 12 = C 13 = D 14 = E and 15 = F
11, 12, 13, 14, 15, 16