A teacher has 6 red balls, 7 blue balls, 8 purple balls, and 4 black balls in a basket. A student reaches into the basket and randomly selects a ball. What is the probability that the ball will be either blue or black?
1
\(\frac{11}{25}\)
2
\(\frac{6}{25}\)
3
\(\frac{3}{25}\)
4
\(\frac{9}{25}\)