What is C(n, r) + 2C(n, r – 1) + C(n, r – 2) equal to? – McqOptions

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1.	What is C(n, r) + 2C(n, r – 1) + C(n, r – 2) equal to?
A.	C(n + 1, r)
B.	C(n – 1, r + 1)
C.	C(n, r + 1)
D.	C(n + 2, r)
Answer» E.

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