Carmichael's two free throws tied it at 75 with 2 seconds left in regulation.
Drexel led by three early in the extra period before the Redbirds (2-0) scored seven consecutive points. Brown hit a tying 3-pointer, then another basket for an 81-79 lead.
The Dragons (0-2) then turned the ball over and Johnny Hill's layup put the Redbirds ahead by four.
Drexel used a 12-1 second-half run to turn a three-point deficit into an eight-point lead. However, a 3-pointer by Brown, followed by a three-point play by Hill, got the Redbirds back into it at 71-69 with 5:06 left.
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