Question 199742
Probability  is  the  ratio  of  the  number  going  the  desired  way,  to  the  total  possible  numbers'
.
something  that  will  not  happen  has  0 chances /  total  possible  chances.,  or  P=0
.
If  something  is  certain,  we  know  all  of  the  chances  will  be  in  numerator / same  number = 1
.
And  the  P = 1,