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1)

if abc= 1, then (11+a+b1+11+b+c1+11+c+a1)=?


A) 0

B) 1

C) 1/ab

D) ab

Answer:

Option B

Explanation:

Given Exp. =(11+a+b1+11+b+c1+11+c+a1) =11+a+b1+b1b1+1+b1c1+aa+ac+1 =11+a+b1+b11+b1+a+aa+b1+1 =1+a+b11+a+b1=1 [abc=1](bc)1 =ab1c1=a and ac=b1