
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The sum of the first seven terms of an arithmetic progression is equal to 20 more than the sum of the first three terms of the same progression. Find the ratio of the first term to the common difference.
A) 1:1
B) 1:2
C) 2:1
D) 1:4
E) 2:3

Present the answer in LaTex format: \boxed{Your answer}
user