railway RRB Technician Grade 1 Mock Test 2024 Quantitative Aptitude Geometry Co-ordinate Geometry

বিন্দু A (a, 0), B (0, b) এবং C (1, 1) সমরৈখিক হবে, যদি

1
a + b = 1
2
\(\rm \frac{1}{a}+\frac{1}{b}=1\)
3
ab = 1
4
কোনোটিই নয় 
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