The sides of a cube are numbered 11 to 16. If Renz rolled the cube once,what is the probability of rolling a composite number?

1 Answer
Feb 19, 2018

#P("composite in "[11,16])=color(blue)(2/3)#

Explanation:

The composite (i.e. non-prime) numbers in #[11,16]#
are #{12,14,15,16}#

That is #4# of the #6# numbers are composite;
so #P("composite")=4/6=2/3#

(assuming that it is a "fair" die).