Q1 of 118 Page 17

Mark the correct alternative in the following:

If , then is equal to


r + r – 10 = 20 ( nCx = nCy ⇒ n = x + y or x = y )


2r – 10 = 20


2r = 30


r = 15


Now,


18Cr = 18C15


18C15 = 18C3


18C3

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