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    				| 1. | Let a, b, c be such that b(a+c) ne0. If |(a,a+1,a-1),(-b,b+1,b-1),(c,c-1,c+1)|+|(a+1,b+1,c-1),(a-1,b-1,c+1),((-1)^(n+2)a,(-1)^(n+1)b,(-1)^(n)c)|=0 then the value of n is : | 
| Answer»  any EVEN INTEGER  | |