यदि _______, तब बिंदु A (a, 0), B (0, b) और C (1, 1) संरेख होंगे। 

1
a + b = 1
2
\(\rm \frac{1}{a}+\frac{1}{b}=1\)
3
ab = 1
4
इनमें से कोई नहीं

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