72.......107-98(9) 98-90(8) 90-83(7) 83-77(6) 77-[72](5) 72-68(4) 65
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107 98 90 83 77 __ 68 65
103, 107, 111
9.3*107
It is 107 - 7 = 100.
9-2=7, 23-9=14, 51-23=28, 107-51=56. therefore, since the next number in the sequence will be twice the previous difference, it will be 107+112 which is 219