1.

If (1 × 2 × 3 × 4 × 5 × …. × n) = n!, then (17! – 16! – 15!) is equal to –1). 17 × 15 × 15!2). 17 × 15 × 16!3). 17 × 16 × 16!4). 16 × 15 × 14!

Answer»

GIVEN, 1 × 2 × 3 × 4 × 5 × …. × n) = n!

17! – 16! – 15!

= 17 × 16 × 15! – 16 × 15! – 15!

= 15! × (17 × 16 – 16 – 1)

= 15! × (16 × 16 – 1)

= 17 × 15 × 15!


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