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Idriss · Answer 1 · 2019-07-29T05:27:03+0000

We can write "n C r" as "C(n,r)" which is more function notation in style.
C(n,r) = C(n,n-r) due to symmetry on Pascal's Triangle

Based on that rule
C(50,45) = C(50,5)
note how n = 50, r = 45, n-r = 50-45 = 5

Answer: Choice B

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