1.

यदि |a|=5, |b|=6 तथा a.b=-25 तब `|axxb|` का मान हैA. 25B. `6sqrt11`C. `11sqrt5`D. `5sqrt11`

Answer» Correct Answer - D
दिया है , `|a| = 5 , |b| = 6` तथा `a * b = - 25`
`because |a xx b|^(2) + |a * b|^(2) = |a|^(2) |b|^(2)`
`implies |a xx b|^(2) + (-25)^(2) = (5)^(2) (6)^(2)`
`implies |a xx b|^(2) + 625 = 25 xx 36`
`implies |a xx b|^(2) = 900 - 625`
`implies | a xx a|^(2) = 275`
`implies | a xx b | = sqrt(275) = 5sqrt(11)`


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