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Question 130Asked in DSSSB TGT Computer Science, 25 Jun 2023, Shift 2 (12:30 PM)

How many INVALID input combinations occur at the input of a BCD adder?

  1. A58
  2. B56
  3. C156
  4. D256
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Correct answer: (C) 156

Explanation

Two 4-bit inputs give 2⁸ = 256 combinations. Only 10 × 10 = 100 are valid BCD digit pairs (0-9 each), so 256 − 100 = 156 combinations are invalid.

From DSSSB TGT Computer Science PYQ, 25 Jun 2023, Shift 2 (12:30 PM)

This is question 130 of DSSSB TGT Computer Science PYQ, 25 Jun 2023, Shift 2 (12:30 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.