ProbabilityMTP June 24 Series IIQuestion 3307 of 170
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A bag contains 15\displaystyle 15 one rupee coins, 25\displaystyle 25 two rupee coins and 10\displaystyle 10 five rupee coins. If a coin is selected at random from the bag, then the probability of not selecting a one rupee coin is:

Options

A0.30\displaystyle 0.30
B0.70\displaystyle 0.70
C0.25\displaystyle 0.25
D0.20\displaystyle 0.20
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Correct Answer

✅ Option b — 0.70\displaystyle 0.70

All Options:

  • A0.30\displaystyle 0.30
  • B0.70\displaystyle 0.70
  • C0.25\displaystyle 0.25
  • D0.20\displaystyle 0.20

About This Chapter: Probability

Paper

Paper 3: Quantitative Aptitude

Weightage

5-7 Marks

Key Topics

Probability Operations, Expected Value

A logic-heavy chapter dealing with random experiments, events (mutually exclusive, exhaustive), set theory probability, conditional probability, and Bayes' Theorem. It forms the basis for Theoretical Distributions.

View Official ICAI Syllabus

Exam Strategy Tip

Always draw a quick Venn Diagram or tree when faced with 'At least one' or 'Only A but not B' wording. It saves you from double-counting.

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