A class of 10 students includes Abby and Ben. A group of 5 students is to be selected from the class. Find the number of possible groups in the following cases. (i) There are no restrictions. (ii) The group includes both Abby and Ben. (iii) The group includes either Abby or Ben, but not both.

Additional Mathematics

IGCSE&ALevel

CAIE

Exam No：0606_w24_qp_22 Year：2024 Question No：7(a)

Answer:

11.2 Know and use the notation n! and the expressions for permutations and combinations of n items taken r at a time.

11.3 Solve problems on arrangement and selection using permutations or combinations.

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