Python but Not SQL

ProbabilityMedium+20 XP+20

A developer survey collected 640 responses. Each respondent reported which of two tools they use at work:

One of the 640 respondents is selected at random. What is the probability that this respondent uses Python but does not use SQL?

Give your answer as a decimal rounded to 3 decimal places (for example, 0.412).

Explore outcomes, set operations, double-counting in addition rules, and conditioning on subsets.

Event Operations

Operations:

Addition Rule Formula

P(A) [Circle]:10/20

P(B) [Blue]:8/20

P(A ∩ B) [Overlap]:6/20

P(A ∪ B) [Union]:P(A) + P(B) - P(A ∩ B) = 10/20 + 8/20 - 6/20 = 12/20 (60%)

Operations on Sets: Toggle union, intersection, and complements. Notice how the visual highlights map exactly to set boundaries.