Question
Evaluate: $\frac{n !}{r !(n-r) !}$ for : $\mathrm{n}=8, \mathrm{r}=6$
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(ii) $\left|\begin{array}{ccc}2 & 3 & 4 \\ 5 & 6 & 8 \\ 6 x & 9 x & 12 x\end{array}\right|$
If $\lim _{x \rightarrow 1}\left[\frac{x^4-1}{x-1}\right]=\lim _{x \rightarrow a}\left[\frac{x^3-a^3}{x-a}\right]$, find all possible values of a.