Matrix multiplication mein AB exist ho sakta hai lekin BA nahi, beta, kyunki columns of A should match rows of B. Agar A ka size 2×3 hai aur B ka 3×4, toh AB bana, lekin BA possible nahi—order matter karta hai jaan.
CBSE class 10 kabhi aise tough questions nahi puchta jaise "find inverse using adjoint" ya "solve equations with matrices"—woh bas basics pe rehta hai.
Yeh main isliye jaanti hoon kyunki maine apne ICSE dost ki madad karte hue ek hafta raat bhar padhai ki thi, jab uske papa ki tabiyat kharab thi aur woh samajh nahi paa raha tha.
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