Question

$(n-1)(n+1)=n^2-1$ pattern is useful for which of the following?

• A. Only for even numbers
• B. Only for odd numbers
• C. Both even and odd numbers
• D. Neither even nor odd numbers

Answer 1

The correct option is C Both even and odd numbers

If $(n-1),n,(n+1)$ are three consecutive natural numbers, then they follow the relation $(n-1)(n+1)=n^2-1$. It does not matter either they are even or odd.