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In a group of 8 girls, two girls are sisters.  The number of ways in which the girls can sit in a row so that two sisters are not sitting together is

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a
4820 
b
1410
c
2830 
d
30240

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detailed solution

Correct option is D

The required number of ways 

= the number of ways in which 8 girls can sit in a row – the number of ways in which two sisters sit together

=8!(2)(7!)=30240.

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