Question

\(_8C_3\cdot _5C_2\)
a.
6720
b.
5.6
c.
3360
d.
560

Answer 1

For combinatorics, you probably want to use a calculator or you can use the equation
\(_nC_r = \large \frac{n!}{( r! (n - r)! )}\)

(In case you don't know what ! mean) ! = factorial, multiply all the numbers from that value all the way to 1

5! = 5\(\times\)4\(\times\)3\(\times\)2\(\times\)1