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Answer
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11C5 = 462

↓Steps Explained:↓

Evaluate the combination:

11C5

Combination Definition:

A unique order or arrangement

Combination Formula:

nCr  =  n!
  r!(n - r)!

where n is the number of items
r is the unique arrangements.

Plug in n = 11 and r = 5

11C5  2  11!
  5!(11 - 5)!

Factorial Formula:

n! = n * (n - 1) * (n - 2) * .... * 2 * 1

Calculate the numerator n!:

n! = 11!

11! = 11 x 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1

11! = 39,916,800

Calculate (n - r)!:

(n - r)! = (11 - 5)!

(11 - 5)! = 6!

6! = 6 x 5 x 4 x 3 x 2 x 1

6! = 720

Calculate r!:

r! = 5!

5! = 5 x 4 x 3 x 2 x 1

5! = 120

Calculate 11C5

11C5  =  39,916,800
  120 x 720

11C5  =  39,916,800
  86,400

Final Answer

11C5 = 462
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