Evaluate: (i) 5! (ii) 7! (iii) 8! (iv) 4! – 3! (v) 7! – 5! – InterviewSolution

1.

Evaluate: (i) 5! (ii) 7! (iii) 8! (iv) 4! – 3! (v) 7! – 5!

Answer»

(i) 5! = 5 x 4 x 3 x 2 x 1 = 120

(ii) 7! = 1 x 2 x 3 x 4 x 5 x 6 x 7 = 5040

(iii) 8! = 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 = 40320

(iv) 4! – 3! = (4 x 3 x 2 x 1) – (3 x 2 x 1) = 24-6= 18

(v) 7! – 5! = (1 x 2 x 3 x 4 x 5 x 6 x 7) -(1 x 2 x 3 x 4 x 5) = 5040 – 120 = 4920

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