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There are 10 girls and 8 boys in a class...

There are 10 girls and 8 boys in a class room including Mr. Ravi, Ms. Rani and Ms. Radha. A list of speakers consisting of 8 girls and 6 boys has to be prepared. Mr. Ravi refuses to speak if Ms. Rani is a speaker. Ms. Rani refuses to speak if Ms. Radha is a speaker. The number of ways the list can be prepared is a 3 digit number `n_(1)n_(2)n_(3)`, then `|n_(3)+n_(2)-n_(1)|=`

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