Question
Out of 36 balls in a bag, some are black and the rest
are white in the ratio 7:5. Two balls are drawn randomly without putting back the first one. What is the probability that both drawn balls are of the same colour?Solution
ATQ.
The number of black balls = 36 × (7/12) = 21 The number of white balls = 36 - 21 = 15 So, the probability that both the balls are black = {²¹C₂ / ³⁶C₂} So, the probability that both the balls are white = {¹⁵C₂ / ³⁶C₂} So, required probability = {²¹C₂ / ³⁶C₂} + {¹⁵C₂ / ³⁶C₂} = (210 + 105) / 630 = 315/630 = 1/2
Which city has been notified as the sole capital of Andhra Pradesh?
What is the development window provided under the SASCI scheme for iconic tourist destinations?
ADB, India sign $350 million loan to expand metro rail network in which city?
What is the key theme of the 7th Rashtriya Poshan Maah 2024, observed by the Ministry of Women and Child Development?
What is the projected cargo capacity of the Vadhvan Port by 2029?
India’s first commercial Gallium Nitride (GaN)-based Mini/Micro LED display facility approved under ISM 1.0 will be set up by:
Under SEBI’s new rules, what is the upper ceiling for determining materiality of Related Party Transactions (RPTs)?
What is the purpose of the IEPFA’s “Saksham Niveshak” campaign?
Which city was ranked as the world’s most polluted city in the 2024 Air Quality Index Report?
- Which chili variety from Telangana received the GI tag recently?
Relevant for Exams:
