The number of values of a for which (a^2-3a+2 )x^2+ (a^2-5a+6 )x+a^2-4=0 is an identity in x, is

JEE Main Mathematics question

The number of values of for which is an identity in , is

Answer: (C)

An identity in needs every coefficient to vanish: , and

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Question ID VK-014117