Question:
If a minyan you davened with didn't say tachanun, but you feel it should be said, is there any benefit of saying it after davening? or does tachanun have to be said immediately after shemoneh esrei?
Thank You
Answer:
If the minyan skipped tachanun with no justification, you should say tachanun. If possible, you should find an unassuming place and say tachanun in it's correct place after Shmone Esrei.