
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
Given complex numbers $z_1 = -1 + 2i$, $z_2 = 1 - i$, $z_3 = 3 - 4i$, and their corresponding points on the complex plane are A, B, and C, respectively. If $\overrightarrow{OC} = \lambda \overrightarrow{OA} + \mu \overrightarrow{OB} (\lambda, \mu \in \mathbb{R})$, then the value of $\lambda + \mu$ is \_\_\_\_\_\_.

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