Ng Tze Henn's answer to Minimi's Junior College 1 H1 Maths Singapore question.
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Treat Ali, Bev and Carla as one big group. 6 ways to rearrange these 3 people and 6 ways to rearrange the 3 big groups, namely (A,B,C) , D and E.
Date Posted:
5 years ago
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