defence exam SSB Head Constable (Communication) 2023 Mock Test Quantitative Aptitude Ratio and Proportion Componendo or Dividendo
यदि (3a + 6b + c + 2d) × (3a - 6b - c + 2d) = (3a - 6b + c - 2d) × (3a + 6b - c - 2d), तो निम्नलिखित में से कौन-सा एक सही है?
1
ab = cd
2
ac = bd
3
ad = bc
4
ad + bc = 0