chassis fans????

i have a cooler master 690 and 3 fans come with the case, and the fans also come with some power connectors. in fact, the fan cable comes out of the fan, attaches to the power connector and then there is another power connector attached to that!!!

do i just connect one of the power connectors or BOTH????
 
Either that or two different types of plugs easy way to find out if this is the case check voltage on Fan if it says 12V plug ONE 12 in
 
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