Seven-segment display — segments required to show the digit 2 For a standard seven-segment display with segments a–g, which segments must be active to display the decimal digit 2?

Introduction / Context:
Seven-segment displays render decimal digits using combinations of the segments a through g. Knowing the correct segment activation pattern is essential for designing decoders and driving logic for numeric indicators in embedded systems and instrumentation.

Given Data / Assumptions:

• Standard seven-segment labeling: a (top), b (upper-right), c (lower-right), d (bottom), e (lower-left), f (upper-left), g (middle).
• We want to display the decimal digit 2.
• Common-cathode/common-anode electrical polarity is irrelevant to the logical pattern.

Concept / Approach:
The digit 2 consists of the top bar, upper-right, middle, lower-left, and bottom bars illuminated. That corresponds to segments a, b, g, e, and d (order may vary). Segment naming confirms the exact set needed.

Step-by-Step Solution:

Verification / Alternative check:
Compare with other digits: “3” would be a, b, c, d, g (no e), confirming that “2” uniquely uses e instead of c.

Why Other Options Are Wrong:

• a, b, c, d, g: that shows “3,” not “2.”
• a, c, d, f, g: that shows “5” (left side segments differ).
• a, b, c, d, e, f: that would illuminate six segments and does not correspond to a standard single digit.

Common Pitfalls:
Mixing up e and c (left vs. right lower verticals) or forgetting the middle bar g for “2.”

Final Answer:
a, b, d, e, and g