I have a question:

As we know, to trade successfully, we need to find out a good signal with high probability to win each trade.

For example, in 100 trades with (stop loss) : (take profit) =1:1, 70 trades are right, and 30 trades are wrong, so, in genaral, we can earn money.

But, I just wonder, if the signal is logically right, why sometimes it gives us wrong trades. (why there are 30 wrong trades). Maybe in the future, the number of wrong trades becomes 40, or 50, or 60. what can guarantee the signal always have a high probabily to win.

As we know, to trade successfully, we need to find out a good signal with high probability to win each trade.

For example, in 100 trades with (stop loss) : (take profit) =1:1, 70 trades are right, and 30 trades are wrong, so, in genaral, we can earn money.

But, I just wonder, if the signal is logically right, why sometimes it gives us wrong trades. (why there are 30 wrong trades). Maybe in the future, the number of wrong trades becomes 40, or 50, or 60. what can guarantee the signal always have a high probabily to win.