For the following questions answer them individually
A husband and wife appear in an interview for two vacancies for same post. The probability of husband getting selected is $$\frac{1}{5}$$ while the probability of wife getting selected is $$\frac{1}{7}$$. Then the probability that anyone of them getting selected is
Find the fundamental Period T of the following continuous signal
$$x(t) = 20 \cos (10 \pi t) + \frac{\pi}{6}$$