Answer:
The probability of selecting a red pen at random can be calculated by dividing the number of red pens by the total number of pens in the box.
Number of red pens = 6
Total number of pens = 6 (red) + 3 (green) + 8 (blue) = 17
Probability of selecting a red pen = \( \frac{6}{17} \)
So, the probability is \( \frac{6}{17} \) or approximately 0.353 (rounded to three decimal places).