The fifth Power of Three book is called Long Shadows
Ravens Gate
Evil Star
five, though there is a first book, second book, third book, into the mist, and the fourth book.
As of now, there are no officially announced plans for another book in the "Power of Five" series by Anthony Horowitz. However, the author may choose to continue the series in the future.
It was released in Autumn 2012.
its 5 to the 4th power times 5 to the fourth power and the answer is 390625
12,207,031
The Answer is 656
They all have different names. The first series is called the Original Series, the second is called The New Prophecy, and the third The Power of Three. Erin Hunter is coming out with a new series called the Omen of the Stars. There is only one book out yet in that series which is called The Fourth Apprentice. I think you're talking about a series as in trilogy, saga, or quintet. I don't know the name of anything other than that, but I just wanted to clear that up.
Autumn 2012 (October)
There hasn't even been a fourth series yet.
54 = 625.