Question

1. (i) 2 x 6! - 3 x 5!​

Answer 1

Answer:

1080

Step-by-step explanation:

2 * 6! - 3 * 5!

= 2*6*5! - 3*5!     [∵ n! = n*(n-1)! = n*(n-1)*(n-2)! = n(n-1)(n-2).....3*2*1]

= 5! (2*6 - 3)

= 5! (12 - 3)

= 5!*9

= 5*4*3*2*1*9    [∵n! = n*(n-1)*(n-2)*(n-3).......3*2*1]

= 120*9

= 1080