By arranging the digits, you can make
1699, 1969, 1996, 6199, 6919, 6991,
9169, 9196, 9619, 9691, 9916 and 9961.
But there are a lot more that you can "make", such as
9*9 + 6 + 1 = 88
or 9^6 + 9 + 1 = 531,451.
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Assuming you have to use all of the numbers: (9 - 4 - 1) x 6 = 24
1 and 18 2 and 9 3 and 6
The range of these numbers is 9 - 1 = 8.
abs(4 - 9) * 6 - 6 or, equivalently, (9 - 4)*6 - 6
1+2+3+4+5+6+7+8+9 = 45