The MGF of a random variable X is :
For discrete distributions, we have
So here, we have :
Now change the indice so that it starts at k=0 :
And this is just a geometric series
Thanks for you're help moo and mr f...sorry for double posting Iam quite new to posting the questions and I thought a question about mgf and then the solving of the gp validated another thread...lesson learnt!
Mr f...sorry, X & Y are random and independent...