The weights of five boxes are 20, 40, 40, 70 & 90 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes?
The combination of 190 = 20, 40, 40, 90
The combination of 180 = 20, 70, 90
The combination of 170 =Â 20, 40, 40, 70
There is no combination for 210.
$$\therefore$$ The correct answer is option C.
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