Connect 12 5 mm led to one 12V DC 1000mA adapter?

Oupulino

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Here is spec fpr 5 mm led
The resistor = 470 ohm 1/4W.

The LED voltage = 3.0v - 3.4v

The LED amp = 20mA

If the adapter output = 1000mA then it is sufficient to connect more than 40 LED together either in series or parallel.

How I do that any wiring diagram link is very appreciated
 
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