MCQ
If $A=[(5,-4),(7,-5)]$, then $3 A^{-1}=$______
- ✓-A
- B-3A
- C`1/3`A
- D3A
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$\ce{Butan - 2 - ol ->[PCl3] X ->[alco. KOH] Y ->[i) H2SO4][ii) H-OH/heat] Z}$
(g = acceleration due to gravity)