3-1=2 then 2x2x4=16.
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only using the numbers once
the only numbers that equal 16 are, 16.
978, of which 360 are 6-digit numbers.If you may use each of the six digits only once, then you can only have 3 pairs of 2-digit numbers beginning with an odd digit.e.g.12 and 34 and 56or 14 and 36 and 52or 16 and 32 and 54
(18 + 16)/sqrt(4) + 7 = 34/2 + 7 = 17 + 7 = 24.
The only prime factor of 16 is 2.