Question

Evaluate:

a)9!/5!3!
b)12!-10!/9!
c)1/3!+1/4!+1/5!
class 11

Answer 1

Step-by-step explanation:

a)

9! = 5! × 6×7×8×9

so, 9! / 5!×3×2

= 5! × 6×7×8×9 / 5! × 6

= 6×7×8×9 / 6

= 7×8×9

= 504

c)

1/3! + 1/4! + 1/5!

= 1/3! ( 1 + 1/4 + 1/(5×4))

= 1/6 ( 1 + 1/4 + 1/20)

= 1/6 × 26/20

= 26/120

= 13/60

Answer 2

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