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Chapter 12: Q23. (page 795)

Evaluate the expression.

P5, 4

Short Answer

Expert verified

The value of the expressionP5, 4 is 120.

Step by step solution

01

Step 1. Define permutation.

When the objects are arranged so that order is important and every possible order of the objects is provided, the arrangements is called a permutation.

02

Step 2. Define the meaning of Pn, r.

The number of permutations of r objects taken from the group of objects n is given by

Pn, r=n!n−r!              ............1

03

Step 3. Evaluate the expression P5, 4.

Use equation (1) to evaluate the expression P5, 4.

P5, 4=5!5−4!=5!1!=543211=120

Therefore, the value of the expressionP5, 4 is 120.

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