Eric L. answered 06/02/21
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The sequence goes, 6-1 = 5, 5-1 = 4, 4 x 2 = 8, 8 + 3 = 11, 11 - 1 = 10, 10 - 1 = 9, and lastly 9 x2 = 18.
Answer is 18
Boruch F.
6-1=5, 5-1=4, 5+4-1=8, 4+8-1=11, 11-1=10, 10-1=9, 10+9-1=1801/10/23