For \( n \in \mathbb{N} \), the largest positive integer that divides \( 81^n + 20n - 1 \) is \( k \). If \( S \) is the sum of all positive divisors of \( k \), then find \( S - k \).
"A judicious mix of both sources - Debt and Equity would increase the EPS" ________ concept of Financial Management is conveyed by the above statement.
Arrange into a paragraph:
1. The streets were wet.
2. We decided to cancel the picnic.
3. Dark clouds covered the sky.
4. Soon, it began to rain heavily.