Question Detail

MTH 101 MTH 101 Past Questions Objective Question

Question

The expansion of \( (1 + y)^{-1} \) is:
Options
A \( \sum_{p=0}^{\infty} (-1)^p y^p \)
Correct Answer
B \( \sum_{p=0}^{\infty} (-1)^p (-y)^p \)
C \( \sum_{p=0}^{\infty} y^p \)
D \( \sum_{p=0}^{\infty} (-y)^p \)
Correct Answer

Option A is the correct answer.

Detailed Explanation

(1+y)^(-1) = 1/(1+y) = 1 - y + y² - y³ + ... = Σ (-1)^p y^p for |y|<1.

Hint

Recall the geometric series: 1/(1+y) = Σ (-1)^n y^n for |y|<1.

Question Info