Number System questions

3 job-exam questions on Number System from 3 papers — BPSC, DPDC — with answers and discussion.

Papers

October 2026 – Written (BPSC) — BPSC · Assistant Programmer (CSE)
May 2025 – Written (BPSC) — BPSC · Assistant Director (ICT)
2020 – Written (BUET) — DPDC · Junior Assistant Manager (ICT)

Questions

(i) (1AC)_{16} = (?)_2 and (?)_{10} (ii) What is the Excess-3 code of 1010?
(a) Consider the following logic circuit with inputs A, B, C and D. (i) Derive the Boolean expressions algebraically for T1 through T4…
What is the binary equivalent for decimal 10?