A Is Never Given In This Question — Solved in Under 60 Seconds (JEE Main 2020 PYQ) #iitjee #jeemaths

A kahin diya hi nahi gaya is sawaal mein — sirf uske results diye gaye hain, teen vectors ke through. Phir bhi det(A) nikaalna hai. Agar aapko pata hai AX=B kaise banate hain, yeh 60 second ka sawaal hai. 📌 SKIP-POINT: Agar aapko turant dikh gaya ki teeno x-vectors ko ek matrix mein stack karna hai aur teeno b-vectors ko doosre mein — seedha 3:56 pe jao, final calculation wahan se shuru hoti hai. 📌 Concept covered: Matrix multiplication via columns + det(PQ)=det(P)det(Q) (Class 12, Matrices) 📌 Difficulty: Medium — near-zero computation, the real skill is the AX=B setup 📌 Ideal solve time once you see it: under 60 seconds PYQ Decoded series ka hissa — har hafte real JEE PYQs jo dekhne mein tricky lagte hain, lekin ek NCERT concept se seedha khulte hain. Timestamp: Part 1: Raw Deal ( where the questions are solved in silence) : 2:46 Part 2: Full Decode (where full explanation is given): 3:56 🔔 Subscribe for daily JEE Main + Advanced Maths, decoded PYQ-by-PYQ. #JEEMains #JEEAdvanced #IITJEE #Matrices #Determinants #JEEMaths #NCERT #JEE2027 #JEEPreparation #MathsForJEE #PYQDecoded #Xerofinity #LinearEquations #JEEMotivation #StudySmart #iitjeemaths #conceptsfirst #jeemain #jeeadvanced #jeerevision #jeemains #jeeadvanced #jee2026 #jee2027 #jeepreparation #jeequestions #highweightagequestions #jeeconcepts #exampreparationtips #iitjee2028 #iitjeeadvanced2027 #advanced2027