Selections (VCE SSCE Mathematical Methods): Quizzes

Order doesn't matter in selections

3

6

$\frac{n!}{r!(n-r)!}$

$^8C_3 \times ^5C_3 = 560$

$2^n$

$127$

Sum of two numbers directly above it

$^nC_r = ^{n-1}C_{r-1} + ^{n-1}C_r$

$\binom{n}{r}$