Higher June 2024 Paper 3 Q13
13 There are 30 students in a class.
A teacher is going to choose at random 2 of the students.
Work out the number of different pairs of students that the teacher can choose. (2)
| Answer | Mark | Mark scheme |
|---|---|---|
| 435 | M1 | for start to method of finding the number of pairs, eg \(30 \times 29\ (= 870)\) oe or \(\dfrac{30 \times 29}{2}\) or clear intention to sum the integers from 1 to 29 eg \(29 + 28 + \ldots + 2 + 1\) |
| A1 | cao |
Additional guidance
M1 for \(\dfrac{1}{30} \times \dfrac{1}{29}\)