1.

Leta = hati+ hatj+ hatkand letr beavariablevectorsuchthatr . "" hati, r."" hatj , r .""Kare positiveintegersifr.ale12thenthe numberof valuesofr is

Answer»

`""^(12)C_(9)-1`
`""^(12 )C_(3)`
`""^(12)C_(4)`
none

Answer :B


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