Question

5 supra 12 ori 4 supra 15 prima intrebare
3 supra 7 ori 7 supra 3 a doua
2 supra 3 ori 3 supra 5 ori 5 supra 4
7 supra 12 ori 3 supra 5 ori 24 supra 49

Answer 1

$\frac{5}{12} * \frac{4}{15} = \frac{5*4}{12*15} = \frac{20}{180} = \frac{2}{18} = \frac{1}{9}$
$\frac{3}{7} * \frac{7}{3} = \frac{21}{21} =1$
$\frac{2}{3} * \frac{3}{5} * \frac{5}{4} = \frac{2*3*5}{3*5*4} = \frac{2}{4} = \frac{1}{2}$
$\frac{7}{12} * \frac{3}{5} * \frac{24}{49} = \frac{7*3*24}{12*5*49} = \frac{504}{2940}= \frac{252}{1470} = \frac{126}{735} = \frac{42}{245}$