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  1. If a + 1/b = 1 and b + 1/c = 1, then c + 1/a = ?
    1. 4
    2. 24
    3. 3
    4. 1
Correct Option: D

Given that, a + 1/b = 1
⇒ a = (1 - 1/b) = (b - 1)/b
⇒ 1/a = b/(b - 1) [reciprocal] ..........................(1)
and b + 1/c = 1
⇒ 1/c = (1 - b)
⇒ c = 1/(1 -b) .........................(2)
∴ c + 1/a ..........................(3)
put the value of c from equ. (2) and 1/a from equ. (1) in equ. (3)
⇒ c + 1/a = 1/(1 -b) + b/(b -1)
⇒ c + 1/a = 1/(1 -b) - b/(1 - b)
⇒ c + 1/a = (1 - b)/(1 - b)
⇒ c + 1/a = 1



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