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3 boys and 3 girls are to sit in a row. ...

3 boys and 3 girls are to sit in a row. How many ways can this be done if (i) there are no restrictions (ii) there is a girl at each end (iii) boys and girls are at alternate palces (iv) all boys sit together

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The correct Answer is:
i) 720, ii) 144, iii) 144
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