Explanation

n = 5 questions  

k = 2 correct  

p = 1/5 = 0.2 probability correct  

q = 4/5 = 0.8 probability wrong  

Formula: P = C(n,k) _ p^k _ q^(n-k)  

P = C(5,2) _ (0.2)^2 _ (0.8)^3  

P = 10 _ 0.04 _ 0.512  

P = 0.2048  

So probability of getting exactly 2 correct = 0.2048 = 128/625 (20.48%)

Last verified on 11-07-2026

Explanation

For n people sitting around a circular table:

Number of arrangements = (n − 1)!

For 10 people:

(10 − 1)! = 9! = 362,880

Last verified on 11-07-2026

Explanation

Explanation

A die has 6 equally likely outcomes: 1, 2, 3, 4, 5, 6.

The odd numbers are 1, 3, and 5, so there are 3 favorable outcomes.

Probability = Favorable outcomes ÷ Total outcomes = 3/6 = 1/2.

Last verified on 03-07-2026

Explanation

• A trade surplus occurs when a country's exports are greater than its imports.
• It means the country sells more goods and services to other countries than it buys from them.
• Trade surplus increases foreign exchange earnings and can strengthen the economy.

Last verified on 01-07-2026