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  1. If a2 = b + c, b2 = c + a, c2 = a + b, then the value of 3
    1
    +
    1
    +
    1
    is :
    a + 1b + 1c + 1
    1. 1
    2. 1/3
    3. 3
    4. 4
Correct Option: C

a2 = b + c
⇒  a2 + a = a + b + c
⇒  a (a + 1) = a + b + c

⇒ 
1
=
a
a + 1a + b + c

Again,
b2 = c + a
⇒  b2 + b = a + b + c
⇒  b (b + 1) = a + b + c
⇒ 
1
=
b
b + 1a + b + c

c2 = a + b
⇒  c2 + c = a + b + c
⇒  c (c + 1) = a + b + c
⇒ 
1
=
c
c + 1a + b + c

∴  3
1
+
1
+
1
a + 1b + 1c + 1

= 3
a
+
b
+
c
a + b + ca + b + ca + b + c

= 3
a + b + c
= 3
a + b + c



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