Question

If 15c2r-1=15c2r+4 find r.
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Answer 1

Answer:

15c2r - 15c2r = 4+1

0= 5...

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Answer 2

Answer:

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

Step-by-step explanation

ncx = ncy

here,

x is not equal to y

so,

x+y = n

( 2r - 1) +  ( 2r + y ) = 15      ( x+y = n)

4r + 3 = 15

4r = 12

r = 3

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