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Friday, 9 October

JEE Main 2026 · MathsNumerical answerNumerical valueMediumMulti-step

JEE Main 4 April 2026, Shift 2, Maths Q21

Question 21 of 75 in this shift, Maths question 21 of 25, Section B.

From a month of 31 days, 3 different dates are selected at random. If the probability that these dates are in an increasing A.P. is equal to ab\frac ab, where a,b∈Na,b\in\mathbb{N} and gcd⁡(a,b)=1\gcd(a,b)=1, then a+ba+b is equal to ________

Official answer

944

NTA final key.

Chapter
Probability
Topic
No close match in our taxonomy
Idea tested
No close match in our taxonomy

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.