How many books are there in the of Famous series?

Please provide the full name of the series you are asking about. "Famous" is too broad a term. There are many series with the word "Famous" in the title, such as:

* The Famous Five by Enid Blyton

* The Famous Five on the Farm by Enid Blyton

* Famous Five: The Secret of the Caves by Enid Blyton

* Famous Five: The Mystery of the Vanishing Dog by Enid Blyton

* Famous Five: The Mystery of the Diamond Necklace by Enid Blyton

* Famous Five: Five Go To Mystery Moor by Enid Blyton

* The Famous Five series by Steve Cole

Let me know which series you're interested in, and I can tell you how many books are in it.