Which word does NOT belong with the others?

In this series, the letters progress by 1; the numbers decrease by 3.

This is a simple multiplication series. Each number is 2 times greater than the previous number.

This is a simple subtraction series; each number is 4 less than the previous number.

Two series alternate here, with every third number following a different pattern. In the main series, 3 is added to each number to arrive at the next. In the alternating series, 5 is subtracted from each number to arrive at the next.

In this series, the letters progress by 2, and the numbers increase by 2.

The core, seeds, and pulp are all parts of an apple. A slice would be a piece taken out of an apple.

A peninsula, island, and cape are all landforms; a bay is a body of water.

Fair, just, and equitable are all synonyms meaning impartial. Favorable means expressing approval.

Unique, rare, and exceptional are all synonyms. Beautiful has a different meaning.

Acute, right, and obtuse are geometric terms describing particular angles. Parallel refers to two lines that never intersect.