Question

If there are n independent trials, p and q the probability of success and failure respectively, then probability of exactly r successes

OR

Let p be the probability of happening an event and q its failure, then the total chance of r successes in n trials is

• A. ${ } ^ { n } C _ { n + r } p ^ { r } q ^ { n - r }$
• B.
• C. ${ } ^ { n } C _ { r } q ^ { n - r } p ^ { r }$
• D.

Answer 1

Answer: (C)

${ } ^ { n } C _ { r } q ^ { n - r } p ^ { r }$

Answer 2

It is a fundamental concept.