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Which rule gives the odd numbers 1, 3, 5, 7, …? (n is the position.)

Class 7Formulas and Rules from PatternsAlgebra

A $2 n + 1$
B $2 n$
Cn + 2
D $2 n - 1$

Step-by-Step Solution

n = 1

→ 1,

n = 2

→ 3,

n = 3

→ 5. Rule

2 n - 1. (2 n + 1

starts at 3, missing the first odd number.)

Answer: D)

2 n - 1

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