If the three vectors 2๐‘–โˆ’๐‘—+๐‘˜,๐‘–+2๐‘—โˆ’3๐‘˜ and 3๐‘–+๐œ†๐‘—+5๐‘˜ are coplanar, then ฮป is

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ะŸะพะบะฐะทะฐั‚ัŒ ะพะฟะธัะฐะฝะธะต
If the three vectors 2๐‘–โˆ’๐‘—+๐‘˜,๐‘–+2๐‘—โˆ’3๐‘˜ and 3๐‘–+๐œ†๐‘—+5๐‘˜ are coplanar, then ฮป is
(a) -1 (b) -2 (c) -3 (d) -4

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