In a university survey: 284 took Economics, 106 took History, 253 took Sociology and 169 took English. If one student is chosen at random, the probability that the student has NOT taken Sociology is —

• a$\frac{253}{812}$
• b$\frac{559}{812}$
• c$\frac{284}{812}$
• d$\frac{169}{812}$