Find function based on limit

[ashen basin]

Does anyone think they can upload a photo of their work for how they solved this problem?

[grave elk]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with: ```diff
   +close

[proven fractal]

try each option one by one and see which one doesn't give 7

[ashen basin]

oh okay, there's no faster option that requires calculations on my end?