Digital Electronics
The Quine– McClusky method of minimization of a logic expression is a (i) graphical method (ii) algebraic method (iii) tabular method (iv) a computer-oriented algorithm The correct answers are

 (iii) and (iv)
 (ii) and (iv)
 (i) and (iii)
 (i) and (ii)

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Digital Electronics
2421 code is

 weighted self-complementing code
 non-weighted self-complementing code
 weighted non-self-complementing code
 non-weighted and non-self-complementing code

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