Probability — UPSC CSAT Previous Year Questions

Practice UPSC CSAT previous year questions from 2011–2026 classified underProbability. Review the original question, four options, correct answer and explanation for every PYQ.

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Probability

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Question 1

UPSC CSAT 2016Basic Probability

A round archery target of diameter 1 m is marked with four scoring regions from the centre outwards as red, blue, yellow and white. The radius of the red band is 0.20 m. The width of all the remaining bands is equal. If archers throw arrows towards the target, what is the probability that the arrows fall in the red region of the archery target?

A0.40

B0.20

C0.16

D0.04

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Correct AnswerC

Explanation

Assuming uniform landing over the target area, probability of the red central circle is area ratio π(0.2)² / π(0.5)² = 0.04/0.25=0.16.

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