Professor Dupré Calc gives her class 20 study questions, from which she will select 8 to be on the final exam. How many ways can she select the questions?

Question

anonymous · Answer

20c8 ways    i think so

anonymous · Answer

yes $$\binom{20}{8}$$ sometimes written as  $_{20}C_8$ and read "20 choose 8"

anonymous · Answer

you compute via $$\frac{20\times 19\times 18\times 17\times 16\times 15\times 14\times 13}{8\times 7\times 6\times 4\times 3\times 2}$$ cancel first, multiply last or use a calculator http://www.wolframalpha.com/input/?i=20+choose+8

anonymous · Answer

think i had a typo above, there should also be a 5 in the denominator