Question 1118939
From the numbers 1 to 50 inclusive, what is the probability of choosing a number which is 
a) greater than 20 
b) greater than 20 and a multiple of 5
————————————————————————————————————————

These are counting problems.  For each problem, the probability is 
          (# of outcomes of interest) / (# of possible outcomes) <br>

a)  P( an element of {21,22,…,50} is selected) = 30/50 = {{{ highlight( 3/5 ) }}} or 0.60 or 60% <br>

b)  P( an element of {25,30,35,40,45,50} is selected) = 6/50 = {{{ highlight( 3/25 ) }}} or  0.12 or 12%