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If bar a = 2bar i-bar j+3bar k, b=-bar i...

If `bar a = 2bar i-bar j+3bar k, b=-bar i + 4bar j-2bar k,bar c=5bar i +bar j +7bar k` and `xbar a+ybar b = bar c` then `(x,y)=` (A) `(3,1)` (B) `(3,-1)` (C) `(-3,1)` (D) `(-3,-1)`

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