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Let a, b, c be such that b(a""+""c)!=...

Let a, b, c be such that `b(a""+""c)!=0` . If `|a a+1a-1-bb+1b-1cc-1c+1|+|a+1b+1c-1a-1b-1c+1(-1)^(n+2)a(-1)^(n+1)b(-1)^n c|=0` then the value of n is (1) zero (2) any even integer (3) any odd integer (4) any integer

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