Answer:
does literally everybody use this to get the answer to their tests
Step-by-step explanation:
N = 20, r = 15;
n C r = ( n * ( n - 1) ( n - 2 ) ... ( n - r + 1 )) / r ! =
20 C 15 = (20 * 19 * 18 * 17 ......8 * 7 * 6) / (15 * 14 * 13 ...* 5 * 4 * 3 * 2 * 1) =
= 15,504
Answer:
They can choose 15 questions in 15,504 ways.
Answer:
1
Step-by-step explanation:
because its the only one where if you run a line down the y axis it only crosses the line at one point
