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Friday, 9 October

JEE Main 2025 · MathsMultiple choiceSingle correctMediumCalculation

JEE Main 7 April 2025, Shift 2, Maths Q9

Question 9 of 75 in this shift, Maths question 9 of 25, Section A.

Let a random variable XX take values 0,1,2,30, 1, 2, 3 with P(X=0)=P(X=1)=pP(X=0)=P(X=1)=p, P(X=2)=P(X=3)P(X=2)=P(X=3) and E(X2)=2E(X)E(X^2)=2E(X). Then the value of 8p−18p-1 is :
  1. (1)0
  2. (2)2Official answer
  3. (3)1
  4. (4)3

Official answer

Option 2

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.