A glass jar contains 6 white, 8 black, 4 red, and 3 blue marbles. If a single marble is chosen at random from the jar, what is the probability that it is black or blue?

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**Solution:**

1. Calculate the total number of marbles:
   - White marbles = 6
   - Black marbles = 8
   - Red marbles = 4
   - Blue marbles = 3

Total marbles = $6 + 8 + 4 + 3 = 21$

2. Calculate the number of favorable outcomes (black or blue marbles):
   - Black + Blue = $8 + 3 = 11$

3. Probability of choosing a black or blue marble is given by:
   $$	ext{Probability} = \frac{	ext{Number of favorable outcomes}}{	ext{Total number of outcomes}} = \frac{11}{21}$$

**Answer:** $\frac{11}{21}$

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