When a quarter is tossed four times, 16 outcomes are possible. hhht hhth hhtt hthh htht htth httt thhh thht thth thtt tthh ttht ttth here, for example, htth represents the outcome that the first toss is heads, the next two tosses are tails, and the fourth toss is heads. the events a and b are defined as follows. a = event exactly two tails are tossed b = event the first and last tosses are the same list the outcomes that comprise the event (a or b)?