If the points (a,0), (0,b) and (1,1) are collinear then 1/a+1/b= ?

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If the points (a,0), (0,b) and (1,1) are collinear then 1/a+1/b= ?
[NTSE Stage 1 2013]

(a) (2−2)^0
(b) 2^0
(c) 2^1
(d) 2^(−1)
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