Answer:
351 ways
Step-by-step explanation:
∵ She wants to choose 2 students from a group of 27 students
∴ The first choice contains 27 choices
∴ The second choice contains 26 choices
∴ She has = 27 × 26 = 702 ways but each group repeated twice
Ex: The group of (Nada , Aly) the same with (Aly , Nada) to avoid that we will divide the answer by 2
∴ She has = 702 ÷ 2 = 351 ways
This operation called Combination
