1.

Evaluate:10! – 6!

Answer»

10! – 6!

= 10 × 9 × 8 × 7 × 6! – 6!

= 6! (10 × 9 × 8 × 7 – 1)

= 6! (5040 – 1)

= 6 × 5 × 4 × 3 × 2 × 1 × 5039

= 3628080



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