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a^{2} = 5 a - 1; b^{2} = 5 b - 1; (a = n o t b)

' হলে সাধারণ সমীকরণটি হবে -

x^{2} - 5 x + 1 = 0

x^{2} - b x + a = 0

x^{2} - a x + b = 0

কোনোটিই নয়

ANS : 3

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