First statement: Nabila > Fahim > Ritu
• Second statement: Shanti > Fahim
• Third statement: Nabila is the second oldest, meaning one person is older than Nabila. 
Since both Shanti and Nabila are older than Fahim, and Nabila is the second-oldest, Shanti must be the oldest. Therefore, Shanti > Nabila > Fahim
• Fourth statement: Ritu > Labib
• Putting everyone together: Shanti > Nabila > Fahim > Ritu > Labib
∴ The third-oldest person is Fahim.

Question: A fair coin is tossed 4 times. What is the probability of getting exactly 3 heads?

Solution:

For 4 tosses, the total number of possible outcomes is = 24 = 16

The number of ways to choose 3 Heads out of 4 tosses is = 4C3 = 4

∴ Probability of getting exactly 3 heads = 4/16 = 1/4

Question: A bag contains 6 red, 4 green, and 5 blue balls. Two balls are drawn without replacement. What is the probability that the first ball is red and the second ball is green or blue?
​
​Solution:
​Given that,
​Red balls = 6
​Green balls = 4
​Blue balls = 5
​Total balls = 6 + 4 + 5 = 15

​We know 
​Probability = Favorable outcomes/Total outcomes

​Now,
​First ball is Red = 6/15 = 2/5
​If first is red, then remaining balls = 14
​Second ball is Green or Blue = (4 + 5)/14 = 9/14
​
​∴ Required probability = (2/5) × (9/14) 
​= 9/35
​
​∴ The required probability is 9/35.