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A GERROTHORAX is an extinct amphibian of the Triassic period from what is now northern Europe...

A GERROTHORAX is an extinct amphibian of the Triassic period from what is now northern Europe that grew to approximately 3 feet in length.

a) In how many ways can the letters in GERROTHORAX be arranged?

b) In how many different ways can the letters in GERROTHORAX be arranged if the first letter must be an X and the last letter must be an O?

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