In how many ways can 5 ladies and 5 gentlemen be seated in a row so that no two ladies sit together

In how many ways can 5 ladies and 5 gentlemen be seated in a row so that no two ladies sit together

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30 Questions 30 Marks 30 Mins

Given:

Number of men = 5

Number of ladies = 4

Concept Used:

The total number of ways to arrange n person = (n - 1)!

The number of all combinations of n things, taken r at a time = nCr

Calculation:

According to the question, we have

The total number of ways to arrange 5 men = (5 - 1)!

⇒ 4!

⇒ 4 × 3 × 2 × 1

⇒ 24

The arrangements of 4 ladies = 5C4 × 4!

⇒ 5 × 4!

⇒ 5 × 4 × 3 × 2 × 1

⇒ 120

Now,

The total number of ways to arrangements = 24 × 120

⇒ 2880

∴ The total number of ways to arrange 5 men and 4 ladies if no two ladies sit together is 2880.

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