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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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