If , then write the values of n.
35Cn+7 = 35C4n-2
n + 7 + 4n – 2 = 35 ( nCx = nCy ⇒ n = x + y or x = y )
5n + 5 = 35
5n = 30
n = 6
And,
n + 7 = 4n – 2
3n = 9
n = 3