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(b) How many different groups of children can be chosen from a class of 18 children if the class contains one set of twins who must not be separated? ​
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(b) How many different groups of children can be chosen from a class of 18 children if the class contains one set of twins who must not be separated?

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User Rajendra Uppal
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9 I think as the twins would be a 2 and you’d put 2 others together
User Rafalio
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