E132 = Indigotine - synthetic blue colouring
E122 = Azoribine - synthetic red colouring
E171 = Titanium dioxide - white mineral based colour
E172 = Iron oxides and hydroxides - orange, red, brown, blank pigment.
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171
The numbers are: (-12+square root of 171) and (-12-square root of 171)
None!!! Because '171' is NOT an EVEN number. Remember even numbers end in 0,2,4,6,and 8. Since '171', does not end in 0,2,4,6 or 8 , then it is not an even number, so it will not divide evenly. NB However, you can divide '171' by '2' , and the answer is 85.5 or 85 1/2
The numbers 1, 3 and 9 all go into both 72 and 171.
If you include 8 and 171, there would be 171-8+1 = 164 If you dont include both, it would be2 less -> 162