Correct: 2 -1 = 1, 9-3=6, 8-5=3, 11-4=7, 17-2=15, 4-3=1, 13-3=10, 27-7=20, 24-14=10, 24-24=0, 8-7=1, 15-5=10, 16-6=10, 19-7=12, 17-4=13, 16-4=12, 11-10=1, 11-6=5, 9-7=2, 22-5-17, Incorrect: 7-1=5 , 10-3=6, 12-6=5, 42-20=21, 4-4=1, 8-2=7, 23-3=19, 23-11=10, 17-4=15, 16-1=14,

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