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NDA 2025 Maths · Mathematics · Binary Number System · medium

The sum (1101)2+(1011)2 in binary is

Single correct option

The sum (1101)2+(1011)2(1101)_2+(1011)_2 in binary is
  1. A. (10110)2(10110)_2
  2. B. (11100)2(11100)_2
  3. C. (10100)2(10100)_2
  4. D. (11000)2(11000)_2
Show answer and solution

Answer: (D) (11000)2(11000)_2

Decimal check: 13+11=24=16+813+11=24=16+8, which is (11000)2(11000)_2. Directly, adding column by column with carries gives 1+1=101+1=10, then the carries ripple to give 1100011000. Missing a carry yields the distractors.
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Original question written in the NDA 2025 Maths pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake