Please answer

Answer Sheet by Dia 1. Which of the following refers to the arrangement of objects in which the order is not important? A. Permutation C. Combination B. Data D. Probability 2. Which of the following refers to the arrangement of objects in which the order is important? A. Permutation C. Combination B. Data D. Probability 3. What is the formula of combinations of n objects taken r at a time? A. 21 C. - (n-r)ri B. D. nl (n-r)int 4. What is the formula of permutation of n objects taken r at a time? C. - n! (n-r)rt B. D. nl (n-r)! 5. How is ncr read? A. combination of n objects taken r at a time B. combination of r objects taken n at a time C. combination of n and r D. combination of n or r 6. Which of the following situation does not require combination? A. Forming a committee of councilors. B. Assigning rooms to conference participants. C. Selecting the top 3 winners in a singing contest. D. Choosing two literature books to buy from a variety of choices. 7. Which of the following requires combination? A. Issuing plate numbers. B. Lining up in paying bills. C. Arranging 6 people in a round table. D. Choosing five badminton players from 12 athletes. candidates? 8. Which is illustrated by "electing a president and a vice-president from 10 A. Permutation B. Combination C. Sets D. cannot be determined