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Let A=[{:(-3,-7,-5),(2,4,3),(1,2,2):}] ...

Let `A=[{:(-3,-7,-5),(2,4,3),(1,2,2):}]` and `B=[{:(a),(b),(1):}]` If AB is a scalar multiple of B, then
(a) `4a+7b+5=0`
(b) `a+b+2=0`
(c) `b-a=4`
(d) `a+3b=0`

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