1

CBSE 12th Mathematics Delhi Set 1 - 2023

Subjective

+5

-0

(a) In answering a question on a multiple choice test, a student either knows the answer or guesses. Let $$\frac{3}{5}$$ be the probability that he knows the answer and $$\frac{2}{5}$$ be the probability that he guesses. Assuming that a student who guesses at the answer will be correct with probability $$\frac{1}{3}$$. What is the probability that the student knows the answer, given that he answered it correctly?

OR

(b) A box contains 10 tickets, 2 of which carry a prize of ₹ 8 each, 5 of which carry a prize of ₹ 4 each, and remaining 3 carry a prize of ₹ 2 each. If one ticket is drawn at random, find the mean value of the prize.

Questions Asked from Probability (Marks 5)

Number in Brackets after Paper Indicates No. of Questions

Class 12 Subjects

Physics

Electromagnetism

Electrostatics Current Electricity Capacitor Magnetic Effect of Current Magnetic Properties of Matter Electromagnetic Induction Alternating Current Electromagnetic Waves

Optics

Modern Physics

Chemistry

Physical Chemistry

Inorganic Chemistry

Organic Chemistry

Mathematics

Relations and Functions

Calculus

Continuity and Differentiability Application of Derivatives Indefinite Integration Definite Integration Application of Integration Differential Equations

Algebra