Question

If 15C2r−1 = 15C2r+4, find r.

Answer 1

Step-by-step explanation:

If 15C2r−1 = 15C2r+4, find r.

Answer 2

Answer:

15C2r-1 = 15C2r+4 , r = 3

Step-by-step explanation:

ncx = ncy

here x is not equal to y

so ,

x+ y = n

(2r-1)+(2r+4) = 15    (x + y = n)

4r + 3 = 15

4r = 12

r = 3

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