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Q.

If a¯=2i¯-j¯+3k¯, b¯=-i¯+4j¯-2k¯, c¯=5i¯+j¯+7k¯ and xa¯+yb¯=c¯ then x,y=

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a

-3, -1

b

-3, 1

c

3,1

d

3, -1

answer is A.

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Detailed Solution

x(2i-j+3k)+y(-i+4j-2k)=5i+j+7k 2x-y=5              2x-y=5       x=4y-1=3                           -2x+8y=2                                      7y=7                                        y=1

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