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Saturday, 31 October

JEE Main 2026 · MathsMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2026, Shift 1, Maths Q10

Question 10 of 75 in this shift, Maths question 10 of 25, Section A.

A bag contains (N+1)(\mathrm{N}+1) coins −- N fair coins, and one coin with 'Head' on both sides. A coin is selected at random and tossed. If the probability of getting 'Head' is 916\frac{9}{16}, then N is equal to:
  1. (1)5
  2. (2)7Official answer
  3. (3)8
  4. (4)9

Official answer

Option 2

NTA final key.

Chapter
Probability
Topic
Bayes' Theorem
Idea tested
Theorem of Total Probability

Same idea in other shifts

Asked 3× in all
  1. 15 Apr 2023, Shift 1 · Q18A bag contains 6 white and 4 black balls. A die is rolled once and the number of balls equal to the number obtained on the die are drawn…MediumSingle correct
  2. 2 Sep 2020, Shift 1 · Q68Box I contains 30 cards numbered 1 to 30 and Box II contains 20 cards numbered 31 to 50. A box is selected at random and a card is drawn…MediumSingle correct

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 108 of the 174 JEE Main shifts held from 2017 to 2026.