Question:‍a, b, c এর ক্রমিক সমানুপাত হলে কোনটি সঠিক? 

A ${\displaystyle a^2=bc}$ 
B ${\displaystyle c^2=ab}$ 
C a = b = c 
D ${\displaystyle b^2=ac}$ 

+ Answer
D 

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Irin Moni

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