You always have a chance to win (if you're not the only one who thinks so)

So today I went on lol and I decided to do ranked for my first match, I felt confident because this week I was on a 9 game winning streak in ranked after stopping for a week or two of ranked play. Except for this match my team started horribly. (Heres the link to the match history http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/1910762235/201649362?tab=overview). Anyway towards the 30 something minute mark my team decided to ff but me and another teammate who i spoke to in the lobby said no and someone else ( i think my adc). We had 3 bad plays that led them to getting baron twice. If by now you looked at the match history and saw my team you may doubt that it wasn't hard to come back but trust me it was the hardest match I've come back from. YI and Wukong on my team were getting sloppy until we had 1 good play in the late 30s or early 40 minute mark where we killed 4 and had 3 alive. This was the turning point where our team pulled together and eventually we won with 5 alive and an ace at there base to end it.

TL;DR As long as you have all 5 players and you don't give up and atleast 2 teammates don't, you have a chance (plus a little luck)!