If $^n{P_3}{ + ^n}{C_{n - 2}} = 14n$, then $n = $
$5$
$6$
$8$
$10$
(a) By inspection $n = 5$.
If the different permutations of all the letter of the word $\mathrm{EXAMINATION}$ are listed as in a dictionary, how many words are there in this list before the first word starting with $\mathrm{E}$ ?
If $'n'$ objects are arranged in a row then the number of ways of selecting three of these objects so that no two of them are next to each othe
What is the number of ways of choosing $4$ cards from a pack of $52$ playing cards? In how many of these
two are red cards and two are black cards,
cards are of the same colour?
If $^n{C_{r – 1}} = 36,{\;^n}{C_r} = 84$ and $^n{C_{r + 1}} = 126$, then the value of $r$ is
Confusing about what to choose? Our team will schedule a demo shortly.
