If 3 î+2 ĵ+8 k̂ and 2 î+xj+k̂ are at right angles then x= (1) 7 (2) -7 (3) 5 (4) -4

If 3 î+2 ĵ+8 k̂ and 2 î+xj+k̂ are at right angles then x=
(1) 7
(2) -7
(3) 5
(4) -4
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