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10-06-2018
Mathematics

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This is for permutations and combinations, what is the answer?

This is for permutations and combinations what is the answer class=

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jimthompson5910 jimthompson5910

10-06-2018

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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