Question

Dr orchid has 9 paintings she wants to hang side by side on her wall...

Answer 1

See below ~

Explanation:

(a) No. of ways :

• 9! ways
• 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
• 72 x 63 x 20 x 6
• 1540 x 378
• 582,120 ways

(b) No. of ways :

• 9 x 8 x 7 x 6
• 72 x 63
• 4,536 ways