The value of ${ }^{\mathrm{n}} C_2$ if ${ }^{\mathrm{n}} C_8={ }^{\mathrm{n}} C_2$ is

Question

Professor PC Thomas Classes · Answer

If ${ }^n C_x = { }^n C_y$, then $n = x+y$. Here $n = 8+2 = 10$. ${ }^{10} C_2 = 45$.