Correct : c
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Here are the comprehensive SEO meta tags based on the provided information: --- **Meta Title:** Staircase Bulb Switches: AND, OR, XOR, NAND Gate Logic | GATE EC 2013 Question 13 **Meta Description:** Understand the logic behind a staircase bulb with two switches β one at ground floor, one at first. Discover if its operation resembles an AND, OR, XOR, or NAND gate. Solve this Electrical & Computer Engineering GATE 2013 Set 3, Question 13 problem and clarify your digital logic concepts. **Meta Keywords:** staircase bulb switches, two switches, digital logic gates, AND gate, OR gate, XOR gate, NAND gate, GATE EC 2013, Electrical Engineering, Computer Engineering, GATE question, exam prep, logic problem, switch logic, truth table, digital electronics, multiple choice question, problem solving, ec-gate-2013-set-3-question-13, examprev
Correct : c
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