Question

The number of ways in which 7 girls form a ring is
(a) 700
(b) 710
(c) 720​

Answer 1

Answer:

720

Step-by-step explanation:

(7-1)!=6!

1. 6×5×4×3×2×1=720

Answer 2

Concept

Circular Arrangement is a special type of Sitting Arrangement, where objects or persons are placed around a circle either facing the center or facing the direction opposite to center.

Given

Number of girls = 7

Find

Number of ways in which 7 girls form a ring

Solution

The formula for arranging n different things in a circular arrangement is given as follows (n−1)!

= (7-1)!

= 6!

= 6 * 5 * 4 * 3 * 2 * 1

= 6 * 5 * 4 * 6

= 36 * 5 *4

= 36 * 20

= 720

In 720 ways 7 girls form a ring.

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