1. (i) 2 x 6! - 3 x 5!
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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
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