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  1. If   a +
    1
    		 = 1, b +
    1
    		 = 1, then the value of (abc) is :
    bc
    1. 0
    2. –1
    3. 1
    4. ab
Correct Option: B

a +
1
 = 1
a

⇒ a = 1 -
1
 =
b - 1
bb

Again,
b +
1
 = 1
c

⇒ b = 1 -
1
 =
c - 1
cc

∴ a =
c - 1
 - 1
b - 1
 = c
b
c - 1
c

=
c - 1 - c
 =
- 1
c - 1c - 1

∴ abc =
- 1
 ×
c - 1
 × c = - 1
c - 1c


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