23. रेखाओं = (i+2j+k) + kti-j+k) और ) = 21-1-k+ u(2i + } + 26) के बीच की न्यूनतम दूरी ज्ञात कीजिए:

[I - j j - k k - i] =

2i · (j xx k) - 3j · (i xx k) - 4k · (i xx j) =

If a = 3i - 2j + k, b = 2i - 4j - 3k, c = -i + 2j + 2k then a + b + c =

If a = i- 2j + k, b = 2i + j - k, c = 4i + 4j + 3k then |(a xx b) xx c| =

The points i + j + k, i + 2j, 2i + 2j + k, 2i + 3j + 2k are

Find the shortest distance between the skew lines ⃗ r = ( ⃗ i + 2 ⃗ j + ⃗ k ) + λ ( ⃗ i − ⃗ j + ⃗ k ) and ⃗ r = ( 2 ⃗ i − ⃗ j − ⃗ k ) + η ( 2 ⃗ i + ⃗ j + 2 ⃗ k )