Question -
Answer -
We know that if nCp = nCq,then one of the following conditions need to be satisfied:
(i) p = q
(ii) n = p + q
So from thequestion nC12 = nC5,we can say that
12 ≠ 5
So, the condition (ii)must be satisfied,
n = 12 + 5
n = 17
∴ The value of nis 17.