# probability

• Jan 3rd 2011, 06:33 AM
jacks
probability
$(1)$ If four positive integers are taken and at random and multiplied together,then the

probability that the last digit is $1,3,7$ or $9$ is.

$(2)$ In a throw of two dice,the probability throwing doublets not more than twice is
• Jan 3rd 2011, 06:42 AM
Plato
Quote:

Originally Posted by jacks
$(1)$ If four positive integers are taken and at random and multiplied together,then the probability that the last digit is $1,3,7$ or $9$ is. $(2)$ In a throw of two dice,the probability throwing doublets not more than twice is

You should understand that this is not a homework service nor is it a tutorial service.
PLease either post some of your own work on this problem or explain what you do not understand about the question.

BTW: As written the answer to part 2 is zero.
• Jan 3rd 2011, 08:07 AM
CaptainBlack
Quote:

Originally Posted by Plato

BTW: As written the answer to part 2 is zero.

Should that be one rather than zero (not more than twice is one or zero times, or have I missed something)??

CB
• Jan 3rd 2011, 09:23 AM
Plato
Quote:

Originally Posted by CaptainBlack
Should that be one rather than zero (not more than twice is one or zero times, or have I missed something)??CB

I missed that not.