100 students appeared for two different examinations. 60 passed the first , 50 the second and 30 both examinations. Find the probability that a student selected at random failed in both examinations?
If people do not believe that mathematics is simple, it is only because they do not realize how complicated life is.
Tobias Dantzig
A MAN IS LIKE A FRACTION WHOSE NUMERATOR IS WHAT HE IS AND WHOSE DENOMINATOR IS WHAT HE THINK ABOUT HIMSELF LARGER THE DENOMINATOR SMALLER THE FRACTION