Vardaan Learning Institute
Answer Key: Probability PYQ
Class: 10 (CBSE)
Subject: Mathematics
Chapter: 14
BOARD EXAM 2025 (Set 30/6/3)
Q17.
Two coins are tossed. Probability of at least one head is
(A) \(\frac{1}{4}\)
(B) \(\frac{1}{2}\)
(C) \(\frac{3}{4}\)
(D) 1
Q19.
Assertion:
\(E_1\): number < 3, \(E_2\): number> 3 are complementary.
Reason:
For complementary events, \(P(E) + P(F) = 1\).
(A) Both true, R explains A
(B) Both true, R doesn't explain A
(C) A true, R false
(D) A false, R true
Q24.
Balls numbered 2 to 91. Find P(2-digit number) and P(multiple of 1).
Total = 90. 2-digit (10-91): 82. P = 41/45.
Multiple of 1: All. P = 1.