Question

dau coroana si 20 puncte

Answer 1

a)
$\frac{1}{12} \times \frac{1}{2} + \frac{1}{12} \times \frac{1}{3} + \frac{1}{12} \times \frac{13}{6} = \frac{1}{24} + \frac{1}{36} + \frac{13}{72} = \frac{1}{4}$
b)1/18
c)79/13