Question 847282
Look at the multiples of 5 in the range: 5,10,15,20,25,30,35,40,45,50.
There are 10 of them. 
Look at the multiples of 6 in the range: 6,12,18,24,30,36,42,48
There are 8 of them.
Look at any number that is both, so you don't count it twice: 30
Between 5 and 50 there are 50-5+1=46 total numbers.
{{{P(5)=10/46}}}
{{{P(6)=8/46}}}
{{{P(5_and_6)=1/46}}}
{{{P=P(5)+P(6)-P(5_and_6)=10/46+8/16-1/46=17/46}}}