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Q21.

Expert-verifiedFound in: Page 635

Book edition
Middle English Edition

Author(s)
Carter

Pages
804 pages

ISBN
9780079039903

**In how many ****orders can eight actors be listed in the opening credits of a movie if the leading actor must be listed first or last?**

There are** 10080 orders **the eight actors can be listed in the opening credits of a movie if the leading actor must be listed first or last.

It is to be determined in how many orders can eight actors be listed in the opening credits of a movie if the leading actor must be listed first or last.

Since the leading actor must be listed first or last, considering that leading actor is first, the remaining 7 actor listing are to be arranged.

When one of the 7 actors is listed, 6 remain to be listed in the next place, then 5 and so on.

By the Fundamental Counting Principle, there are $7\times 6\times 5\times 4\times 3\times 2\times 1=5040$ different orders the 7 actors can be listed if the leading actor is considered to be listed first.

Similarly, when the leading actor is listed last there are 5040 more orders.

Hence, by Fundamental Counting Principle, there are 10080 orders the eight actors can be listed in the opening credits of a movie if the leading actor must be listed first or last.

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