1=5

2=7
3=9
4=11
What is the rule

2x+4

i meant to say 2x + 3

To determine the rule or pattern in the given sequence, we need to analyze the relationship between the numbers.

Looking at the sequence, we can see that the pattern seems to be an arithmetic progression, where each number is obtained by adding a constant difference to the previous number.

Let's find the constant difference:

To get from 1 to 5, we need to add 4.
To get from 2 to 7, we need to add 5.
To get from 3 to 9, we need to add 6.
To get from 4 to 11, we need to add 7.

Observing these differences, we can see that the difference itself is increasing by 1 each time.

So, the rule or pattern of the given sequence is to add the position number (n) to the starting number (1) in order to get the nth term. In mathematical terms, the rule is:

nth term = starting number + (n - 1)

For example:
5th term = 1 + (5 - 1) = 1 + 4 = 5
7th term = 1 + (7 - 1) = 1 + 6 = 7

Therefore, the rule for the given sequence is to add the position number (n) minus 1 to the starting number (1) to get the nth term.