1.

` hati . ( hatj xx hatk )+ ( hatk xx hati ) + hatk . ( hati xx hatj )` का मान ज्ञात कीजिए ।

Answer» ` hati .( hatj xx hatk)+ hatj .( hatk xx hati ) + hatk .( hati x hatj )`
` = hati . hati + hatj . hatj + hatk . hatk `
` =1 +1+1=3`


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