defence exam SSB Head Constable (Communication) 2023 Mock Test Quantitative Aptitude Ratio and Proportion Componendo or Dividendo
If (3a + 6b + c + 2d) × (3a - 6b - c + 2d) = (3a - 6b + c - 2d) × (3a + 6b - c - 2d), then which one of the following is correct?
1
ab = cd
2
ac = bd
3
ad = bc
4
ad + bc = 0