1.

Priyankahas 11 differenttoysand supriyahas8 differentroys. Findthe numberof waysin whichtheycan exchangetheirtoysso thateachkeepsherinitialnumber of toys .

Answer»

`"^(19)C_(11)`
`"^(18)C_(10)`
`"^(20)C_(11)`
`"^(19)C_(11) -1`

Answer :D


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